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integumentary system, bones, axial and app. skeleton, and joints

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Term
Definition
skin layers   epidermis (superficial layer) dermis NOT TECHNICALLY A LAYER: Hypodermis or superficial fascia  
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epidermis   top layer of skin made of keratinized stratified squamous epithelium 4-5 layers 4 cell types keratinocytes, melanocytes, merkel cells, and langerhan's cells, function: protection  
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cell types in epidermis   keratinocytes: melanocytes: Merkel Cells: Langerhans cells:  
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keratinocytes:   mostly produce keratin (fibrous protein)  
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melanocytes   produce melanin and makes up 10-25% of the cells in the lower epidermis  
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Merkel Cells   touch receptors (tactile)  
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Langerhans cells   macrophages that assist in cell immunity  
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layers of the epidermis   top to bottom: stratum corneum stratum granulosum stratum spinosum stratum basale  
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stratum corneum   20-30 rows of keratinized dead cells 3/4 of the thickness of the epidermis function: protection from abrasion, waterproofs, barrier against attack  
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Stratum Granulosum   3-5 layers of layers that get flattened Keratohyaline and lamellated granules accumulate  
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Stratum Lucidum (clear layer) ONLY FEET AND HANDS   thick skin only (soles of feet and palms of hands) several layers of DEAD keratinized cells  
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Stratum Spinosum   Abundant melanin granules in keratinocytes dendritic or Langerhan’s cells  
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Stratum Basale   attached to the dermis one row of stem cells it takes 25-45 days for cells to go from basal layer to top of skin  
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dermis   strong and flexible connective tissue two layers: reticular & papillary  
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papillary layer   areolar connective tissue with collagen and elastic fibers Dermal papillae contain: Capillary loops Meissner’s corpuscles Free nerve endings  
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Reticular layer   80% thickness of the dermis contain collagen fibers and elastic fibers  
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skin markings   friction ridges and cleavage lines  
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friction ridges   Epidermal ridges that are on top of l deeper dermal papillary ridges (form friction ridges of fingerprints)  
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cleavage lines   Collagen fibers arranged in bundles form cleavage (tension) lines  
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Incisions made parallel to cleavage lines heal more readily   true  
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Sensory receptors in dermis   Pacinian corpuscles Meissner corpuscles free nerve endings  
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Pacinian corpuscles   stimulated by heavy pressure deep in dermis  
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Meissner corpuscles   tactile sense to light touch (dermal papillae)  
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Free Nerve endings   respond to temperature (in basal layer of epidermis)  
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Hypodermis   subcutaneous layer below skin composed of adipose tissue and areolar connective tissue  
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Skin color pigments   Melanin Carotene Hemoglobin  
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Melanin   Produced in melanocytes; migrates to keratinocytes where it forms “pigment shields” for nuclei Freckles and pigmented moles: Local accumulations of melanin  
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Carotene   Yellow to orange, most obvious in the palms and soles  
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Hemoglobin   Responsible for the pinkish hue of skin  
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Appendages of the skin   Sweat glands Oil glands Hairs and hair follicles Nails  
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Sweat gland types   Eccrine Apocrine  
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Eccrine sweat glands   Abundant on palms, soles, forehead and all over the body Sweat: 99% water, NaCl, vitamin C, antibodies, metabolic wastes Ducts connect to pores Function in thermoregulation  
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Apocrine sweat glands   Confined to axillary and anogenital areas Sweat: fatty substances and proteins Ducts connect to hair follicles puberty onward (as sexual scent glands?) Does not participate in thermoregulation  
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Specialized apocrine glands   Ceruminous glands—in external ear canal; secrete cerumen Mammary glands  
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Sebaceous (oil) glands   Widely distributed Most develop from hair follicles Become active at puberty  
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Sebum   Oily holocrine secretion Bactericidal Softens hair and skin  
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Functions of hair   Maintain warmth Alerting the body to presence of insects on the skin Guards scalp against physical trauma, heat loss, and sunlight  
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Hair distribution   over the entire body except for palms, soles, and lips  
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Hair Follicle parts   shaft hair root bulb  
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hair follicle wall   2 layers outer connective tissue root sheath inner epithelial root sheath  
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hair follicle location   from epidermal surface to dermis  
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Arrector pilli   smooth muscle attached to follicle causes goose bumps  
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Hair follicle receptor (root hair plexus)   Sensory nerve endings around each hair bulb Stimulated by bending a hair  
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Types of hair   Vellus Terminal  
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Vellus   pale, fine body hair of children and adult females  
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Terminal   coarse, long hair of eyebrows, scalp, axillary, and pubic regions (and face and neck of males)  
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Functions of Integumentary System   Protection (3 types) Body temp regulation cutaneous sensations metabolic function blood reservoir excretion  
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Function: Protection   Three types: Chemical Physical/mechanical barriers Biological barriers  
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Protection: chemical barrier   Low pH secretions (acid mantle) and defensins retard bacterial activity  
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Protection: physical barrier   Keratin and glycolipids block most water and water- soluble substances  
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Protection: biological barrier   Dendritic cells, macrophages, and DNA  
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Function: Body Temp   ~500 ml/day of routine insensible perspiration (at normal body temp) At high temps, dilation of dermal vessels and increased sweat gland activity (sensible perspirations) cool the body  
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Function: Cutaneous sensations   Temperature, touch, and pain  
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Function: Metabolic functions   Synthesis of vitamin D precursor and collagenase  
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Function: blood reservoir   up to 5% of body’s blood volume  
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Function: excretion   nitrogenous wastes and salt in sweat  
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Skin cancer types   Basal cell carcinoma (least malignant, most common) Squamous cell carcinoma (second most common) Melanoma (most dangerous)  
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Basal cell carcinoma   Stratum basale cells proliferate and slowly invade dermis and hypodermis Cured by surgical excision in 99% of cases  
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Squamous cell carcinoma   Involves keratinocytes of stratum spinosum Most common on scalp, ears, lower lip, and hands Good prognosis if treated by radiation therapy or removed surgically  
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Melanoma   Involves melanocytes Highly metastatic and resistant to chemotherapy Treated by wide surgical excision accompanied by immunotherapy  
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Burns   damage: tissue damage, denatured protein, cell death) Immediate threat: Dehydration and electrolyte imbalance, leading to renal shutdown and circulatory shock  
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Rule of Nines   Used to estimate the volume of fluid loss from burns head and neck: 9% upper limbs: 18% trunk: 36% lower limbs: 36% perineum: 1%  
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Partial Thickness Burns   First degree Second degree  
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First Degree burn   Epidermal damage only Localized redness, edema (swelling), and pain  
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Second degree burn   Epidermal and upper dermal damage Blisters appear  
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Full Thickness Burn (3rd degree)   Entire thickness of skin damaged Gray-white, cherry red, or black No initial edema or pain (nerve endings destroyed) Skin grafting usually necessary  
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skeletal cartilage   Has no blood vessels 3 types: hyaline fibrocartilage elastic  
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types of bone growth   oppositional interstitial  
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interstitial growth   bones to grow in length  
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oppositional growth   bones grow in thickness (width)  
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axial skeleton   bones of the skull, vertebral column, and rib cage  
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appendicular skeleton   bones of the upper and lower limbs, shoulder, and hip  
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long bones   longer than they are wide (humerus, tibia, etc)  
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short bones   Cube-shaped bones (in wrist and ankle) Sesamoid bones (within tendons, e.g., patella)  
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Flat bones   Thin, flat, slightly curved  
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irregular bones   Complicated shapes  
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Functions of bones   Support – Protection – Movement – Mineral storage – Blood cell formation Triglyceride  
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Function: Support   form the framework that supports the body and cradles soft organs  
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Function: Protection   provide a protective case for the brain, spinal cord, and vital organs  
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Function: Movement   provide levers for muscles  
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Function: Mineral storage   reservoir for minerals, especially calcium and phosphorus  
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Function: Blood cell formation   hematopoiesis occurs within the marrow cavities of bones  
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Function: Energy storage   Triglyceride (energy) storage in bone cavities  
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Bone textures   Compact bone Spongy bone  
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Compact bone   Dense outer layer Made of osteons  
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Spongy (cancellous) bone   Made of honeycomb of trabeculae  
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Structure of a long bone   Diaphasis Medullary Cavity Epiphysis  
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Diaphasis   shaft of bone Compact bone collar surrounds medullary (marrow) cavity  
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Medullary Cavity   in adults contains fat (yellow marrow)  
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Epiphyses   Expanded ends Spongy bone interior Epiphyseal line (remnant of growth plate) Articular (hyaline) cartilage on joint surfaces  
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Membranes of bones   Peristeum Endosteum  
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Endosteum   Delicate membrane on internal surfaces of bone Also contains osteoblasts and osteoclasts  
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Peristeum   Outer: fibrous layer Inner: osteogenic layer Osteoblasts Osteoclasts Osteogenic cells (stem cells) Nerve fibers, nutrient blood vessels, and lymphatic vessels enter the bone via nutrient foramina Secured to underlying bone by Sharpey’s fibers  
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diploe   spongy bone in flat bones  
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Structure of Short, Irregular, and Flat Bones   Periosteum-covered compact bone on the outside Endosteum-covered spongy bone within Bone marrow between the trabeculae Have no diaphysis or epiphyses  
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Location of Hematopoietic Tissue (Red Marrow)   Adults: red marrow cavities Trabecular cavities of the heads of the femur and humerus Trabecular cavities of the diploë of flat bones Infants: red marrow Medullary cavities All spaces in spongy bone  
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Osteoblasts   bone forming cells  
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Osteoclasts   break down bone  
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Osteocytes   mature bone cells  
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Osteogenic (osteoprogenitor) cells   Stem cells in periosteum and endosteum that give rise to osteoblasts  
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Haversian system, or osteon   structural unit of compact bone  
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Lamellae   Weight-bearing Column-like matrix tubes  
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Chondrocytes   Are in between the lamella  
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Lacunae   small cavities that contain osteocytes  
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types of canals in compact bone   Perforating (Volkmann’s) canals Central (Haversian) canal Canaliculi  
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Perforating (Volkmann’s) canals   At right angles to the central canal Connects blood vessels and nerves of the periosteum and central canal  
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Central (Haversian) canal   Contains blood vessels and nerves  
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Canaliculi   hairlike canals that connect lacunae to each other and the central canal  
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Trabeculae   spongy bone align along lines of stress no osteons capillaries in endosteum supply nutrients Contain irregularly arranged lamellae, osteocytes, and canaliculi  
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Chemical Composition of Bone: Organic   osteoblasts osteoclasts, osteocytes, osteogenic cells, osteoid  
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Osteoid   organic bone matrix secreted by osteoblasts Ground substance (proteoglycans, glycoproteins) Collagen fibers Provide tensile strength and flexibility  
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Chemical Composition of Bone: Inorganic   Hydroxyapatites (mineral salts)  
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Hydroxyapatites (mineral salts)   65% of bone by mass Mainly calcium phosphate crystals Responsible for hardness and resistance to compression  
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Osteogenesis   bone tissue formation  
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Stages of osteogenesis   Bone formation—begins in the 2nd month of development Postnatal bone growth—until early adulthood Bone remodeling and repair—lifelong  
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Types of Ossification   Intramembranous ossification Endochondral ossification  
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Intramembranous ossification   Membrane bone develops from fibrous membrane Forms flat bones, e.g. clavicles and cranial bones  
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Endochondral ossification   Cartilage (endochondral) bone forms by replacing hyaline cartilage Forms most of the rest of the skeleton Uses hyaline cartilage models Requires breakdown of hyaline cartilage prior to ossification  
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postnatal bone growth   interstitial oppositional  
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Growth in length of long bones   4 zones: Proliferation (growth) Hypertrophic Calcification Ossification (osteogenic)  
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Growth Hormone   stimulates epiphyseal plate activity  
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Thyroid Hormone   modulates activity of growth hormone  
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Testosterone and estrogens (at puberty)   Promote adolescent growth spurts End growth by inducing epiphyseal plate closure  
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Bone Deposit   occurs where a bone is damaged which provides extra support person needs to have a healthy diet  
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Bone Reabsorption   osteoclasts secrete Lysosomal enzymes (digest organic matrix) Acids (convert calcium salts into soluble forms)  
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Hormones in bone (BONE GROWTH)   children: growth and thyroid hormone adults: estrogen or testosterone  
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Hormones for calcium homeostasis   when blood Ca is low: PTH increases activity of osteoclasts When blood calcium is high: Calcitonin increases activity of osteoblasts  
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Osteoporosis   loss of bone mass osteoclasts outpace osteoblasts  
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Osteomalacia   calcium salts not deposited which causes vitamin d deficiency  
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Rickets   childhood disease that causes bowed legs  
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Wolff's law   A bone grows or remodels in response to forces or demands placed upon ex. if right handed: bones of right hand are stronger than the left hand area where bone curves is thickest  
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Why is calcium necessary?   Transmission of nerve impulses Muscle contraction Blood coagulation Secretion by glands and nerve cells Cell division  
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cranial bones   frontal, pariteal, occipital, temporal, sphenoid, ethmoid  
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temporal bones projections   Zygomatic process Mastoid process Styloid process  
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temporal bones openings   External auditory/acoustic meatus  where ear is Jugular foramen Carotid canal  
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mandibular fossa   Mandibular fossa – - Articulation: mandibular fossa articulates with the mandibular condyle of the mandible  
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occipital bone   contains: foramen magnum: for spinal cord occipital condyles external occipital protruberance hypoglossal canal  
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Sphenoid bone   Optic canal/foramen – between the 2 wings R - foramen rotundum O – foramen ovale S – foramen spinosum  
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Ethmoid bone   upper part of nasal septum – vertical plate  
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Sutures   joints between cranial bones  
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Corona suture   between frontal and parietal  
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sagittal suture   between parietal bones  
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Squamous suture   between temporal and parietal  
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lambdoid suture   between occipital and parie  
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Facial bones   Mandible Maxillae Palatine Zygomatic Nasal Lacrimal Vomer Inferior nasal concha  
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Mandible   lower jaw body ramus mandibular condyles – posterior projection of the ramus articulation: mandibular condyle articulates with mandibular fossa of the temporal bones coronoid process – anterior projection of the ram  
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nasal bone   forms the bridge of the nose  
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lacrimal bone   has a depression of the nasolacrimal duct  
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vomer   has a depression of the nasolacrimal duct  
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inferior concha   plates of bone in the nasal cavity  
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zygomatic bone   cheek bone forms the zygomatic arch with the zygomatic process of the temporal bone  
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hard palate   anteriorly – maxilla posteriorly – palatine bone  
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nasal septum   superior part – ethmoid bone inferior part – septal cartilage  
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fetal skull   Fontanels – spaces between cranial bones anterior fontanel – closes after 11/2 years posterior fontanel – closes at birth  
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Paranasal sinuses   Paranasal sinuses: mucus membrane lined air filled cavities of the bones maxillary sinus frontal sinus ethmoid sinus sphenoid sinus  
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Parts of the vertebal column   Cervical vertebrae – 7 Thoracic vertebrae – 12 Lumbar vertebrae – 5 Sacrum -1 Coccyx – 1  
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vertebral curvatures   Cervical and lumbar Thoracic and sacral  
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scoliosis   abnormal lateral curvature  
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kyphosis   exaggerated thoracic curvature (hunchback)  
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Lordosis   exaggerated lumbar curvature  
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Intervertebral discs   between the vertebrae, made with fibrocartilage  
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Intervertebral foramen/mina   holes between the vertebra laterally. The spinal nerves emerge from it/them  
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cervical vertebrae   Special features of all cervical vertebrae: transverse foramen – on all cervical vertebrae Spinous process - bifid or divided and short – except C1, and C7 Small vertebrae  
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atlas: C1   No body No spinous process Transverse foramen present Superior articular process – large Articulation: superior articular process articulates with the occipital condyle of the skull  
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Axis: C2   body transverse foramen present  
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C3-C7   Body small Spinous process bifid except C7 Transverse foramen C7 – vertebra prominence - spinous process is long – looks like in thoracic vertebrae  
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Lumbar vertebrae (5)   large vertebrae spinous process – short and thick, like a hatchet  
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Sacrum   forms posterior wall of the pelvis sacral foramina ala – laterally articulation: ala articulates with the auricular surfaces of hip bone (illium)  
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Coccyx   tail bone  
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Thoracic cage   thoracic vertebra sternum ribs and the costal cartilages  
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Sternum   manubrium – superior part articulation: manubrium articulates with the clavicle and 1st and 2nd ribs Body articulation: body articulates with costal cartilages xiphoid process  
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ribs   all attach posteriorly to  vertebrae all attach anteriorly through costal cartilages to the sternum directly or indirectly  
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ribs 1-7 (true ribs)   Ribs 1-7- true ribs – attach directly to sternum through costal cartilages  
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ribs 8-12 (false ribs)   attach indirectly to sternum by joining costal cartilage of the rib above  
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ribs 11-12 (floating ribs)   no anterior attachment to the sternum  
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Parts of a rib   Head Articulation: head of the rib articulates with the demi facets on the vertebral body Neck Tubercle Articulation: tubercle of the rib articulates with the facet on transverse process  
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Appendicular   Pectoral girdle upper limb bones pelvic girdle lower limbs  
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Pectoral girdle:   Clavicle and scapula  
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upper limb bones   Arm, forearm, wrist, hand, fingers  
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pelvic girdle   Hip bones (2)  
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lower limbs bones   thigh, leg, ankle, foot, toes  
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clavicle   sternal end Articulations: Sternal end or medial end articulates with  sternum acromial end Articulations: Acromial end or lateral end articulates with  acromial process of scapula  
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Scapula   boarders  superior, lateral and medial anterior surface: Corocoid process Subscapular fossa  
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Humerus   arm bone Superior end: Head of humerus – Articulation – head with the glenoid fossa of the scapula Neck  
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Humerus: Coronoid fossa   medial, on the anterior surface of humerus, above the trochlear Articulation: coronoid fossa articulates with the coronoid process of ulna when the elbow is flexed  
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Humerus: Radial fossa   lateral, on the anterior surface of humerus, above the capitulum articulation: radial fossa articulates with the radial head when the elbow is flexed  
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Humerus: Olecranon fossa   on the posterior surface of humerus articulation: olecranon fossa articulates with the olecranon process of the ulna when the elbow is extended  
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Carpal bones   8  
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Metacarpals   5  
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Phalanges   14 2 in thumb 3 in each digit  
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Pelvic girdle   Hip bones: 3 Ileum (hands of hips) Ischium (sit on) Pubic (in the front)  
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true pelvis   below pelvic brim  
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Femur: Distal end: Medial condyle   medially Articulation: medial condyle articulates with the medical condyle of tibia  
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articulation   site where two bones meet  
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functions of articulations   Give the skeleton mobility Hold the skeleton together  
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Three functional classifications:   Synarthroses Amphiarthroses Diarthroses  
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Diarthroses   freely movable  
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Amphiarthroses   slightly movable  
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Synarthrosis   immovable  
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Three structural classifications   Fibrous Cartilaginous Synovial  
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Flexion   bending movement that decreases the angle of the joint  
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extension   reverse of flexion; joint angle is increased  
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abduction   movement away from the midline  
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adduction   movement toward the midline  
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circumduction   movement describes a cone in space  
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plantar flexion   extension of the foot (pointed toes)  
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dorsiflexion   flexion of the foot (flat foot)  
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Inversion   turn sole medially (sole inwards)  
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nonaxial   slipping movements only  
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uniaxial   movement in one plane  
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biaxial   movement in two planes  
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multiaxial   movement in or around all three planes  
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insertion   attachment to the movable bone  
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origin   attachment to the immovable bone  
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intracapsular   deep to capsule; covered by synovial membrane  
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