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Mod 1B A&P Ch. 6
The Integumentary System & Body Membranes (DL)
| Question | Answer |
|---|---|
| Integumentary System | Skin, nails, and hair. |
| Epithelial Membranes | Composed of epithelial tissue and an underlying layer of specialized connective tissue. |
| Connective Tissue Membranes | Composted exclusively of various types of connective tissue; no epithelial cells are present in this type of membrane. |
| Types of Epithelial Membranes | Cutaneous, Serous, Mucous |
| Cutaneous Membrane | Skin; primary organ of the integumentary system. (One of the most important and largest of visible organs. |
| Serous Membrane | Found only on surfaces within closed cavities; composed of two distinct layers of tissue. |
| Basement Membrane | A thin glue-like membrane that holds and supports the epithelial cells. |
| Parietal Portion | Type of serous membrane which lines the walls of a body cavity. |
| Visceral Portion | Type of serous membrane that covers the surface of organs found in body cavities. |
| Pleura | The serous membrane found in the Thoracic cavity. |
| Peritoneum | The serous membrane found in the abdominal cavity. |
| Pleurisy | A very painful pathological condition characterized by inflammation of the serous membranes that line the chest cavity and cover the lungs. |
| Peritonitis | Inflammation of the serous membranes in the abdominal cavity. |
| Mucous Membrane | Epithelial membranes that line body surfaces opening directly to the exterior. |
| Mucocutaneous Junction | The transitional area that serves as a point of "fusion" where skin and mucous membranes meet. |
| Connective Tissue Membranes | Do not contain epithelial components; composed of connective tissue. |
| Synovial Membranes | Line the spaces between bones and joints that move; are smooth and slick and secrete synovial fluid |
| Synovial fluid | Thick and colorless lubricating fluid |
| Bursae | Small cushion-like sacs found between moving body parts, which make movement easier. |
| Two main layers of the skin | Epidermis and Dermis |
| Epidermis | The outermost layer of the skin; one of the two main layers of the skin. thin sheet of stratified squamous epithelium. |
| Dermis | The deeper of the two main layers of skin. It is thicker than the epidermis and is made up largely of connective tissue. |
| Subcutaneous Tissue | (Hypodermis) Thick layer of loose connective tissue that supports the layers of the skin. |
| Stratum Germinativum | The cells of the innermost (deepest) layer of the epidermis; undergoes mitosis and reproduce themselves. Also responsible for production of melanin. |
| Keratin | A protein substance that is a tough, waterproof material that provides cells in the outer layer of the skin with a horny, abrasion-resistant, and protective quality |
| Stratum Corneum | The tough outer layer of the epidermis. |
| Pigment Layer | Another terms for stratum germinativum. The deepest cell layer of the epidermis; responsible for production of the pigment called melanin. |
| Melanin | Gives color to the skin; pigment. |
| Melanocytes | The pigment producing cells in the epidermis |
| Cyanosis | A condition when blood oxygen levels decrease and skin turns a bluish gray color. |
| Vitiligo | A condition characterized by patchy looking areas of light skin resulting from the acquired loss of epidermal melanocytes. |
| Albinism | A hereditary condition characterized by a partial or total lack of melanin pigment in the skin and eyes. |
| Areolae | The skin surrounding the nipples. |
| Freckle | Small flat macules (flat skin lesions) |
| Dermal-epidermal Junction | The junction that exists between the thin epidermal layer of the skin above and the dermal layer below. |
| Dermal Papillae | Parallel rows of peglike projections. |
| Striae | Stretch marks (like that happens sometimes during pregnancy) |
| Strawberry Hemanigioma | One of the most common birthmarks that may initially appear as a bruise at birth and then grow rapidly during the first year; |
| Birthmark | Developmental malformation of dermal blood vessels. |
| Port-wine stain | A vascular birthmark that is permanent and do not fade with age. |
| Follicles | Specialized structures required for hair growth. |
| Lanugo | The hair of a newborn infant. |
| Hair Follicle | A small tube where hair growth begins. |
| Hair Papilla | A cap-shaped cluster of cells that begin hair growth. |
| Alopecia | Hair loss of any kind. |
| Arrector Pili | A tiny smooth (involuntary) muscle. (Produces goose pimples) |
| Lamellar (Pacini) Corpuscle | One of the two skin receptors, which detects pressure deep in the dermis. |
| Tactile (Meissner) Corpuscle | One of the two skin receptors, which detects light touch. |
| Cuticle | A fold of skin that hides the nail root. |
| Lunula | The crescent-shaped white area of the nail (little moon). |
| Onycholysis | A condition where a minor trauma to long fingernails can cause loosening of the nail from the nail bed with a resulting seperation that starts at the distal or free edge of the affected nail. |
| Two varities of Skin Glands | Sudoriferous(sweat) or sebaceous. |
| Sudoriferous (Sweat) Gland | Most numerous of the skin glands; gland that secretes sweat. |
| Two clasifications of Sudoriferous (Sweat) Glands | Apocrine and Eccrine |
| Apocrine Sweat Gland | Found primarily in the skin of the armpit and in the pigmented skin areas around the genitals. |
| Eccrine Sweat Gland | Distributed over the total body surface; produce perspiration. |
| Pores | Outlets of small ducts from the eccrine sweat glands. |
| Sebaceous Glands | Secrete oil for the hair and skin. |
| Sebum | The oil that lubricates the hair and skin |
| Acne | A bacterial infection of the skin characterized by red pustules formed when hair follicles become infected. |
| Acne Vulgaris | The most common kind of acne; results from an increase in sebum secretion. |
| Papules | Inflamed lesion (acne) |
| Pustules | Pus filled pimples |
| Three functions of the skin | Protection, temperature regulation, sense organ activity |
| Protection | Skin as a whole is described as a first "line of defense". |
| Temperature Regulation | Regulates sweat secretion and by regulating the flow of blood close to the body surface. |
| Sense Organ activity | The specialized receptors in the skin make it possible for the body to detect sensations of light touch and pressures, pain, heat and cold. |
| Lesion | Any measurable variation from the normal stucture of a tissue. |
| Classification and Severity of Burns | Depth and number of tissue layers involved, total body surface area affected, type of homeostatic mechanisms that are damaged or destroyed. |
| First Degree Burn | Minor discomfort and some reddening of the skin, no blistering (for example: sunburn) |
| Second Degree Burn | Blisters, severe pain, generalized swelling and fluid loss and scarring is common. Involves the deep epidermal layers and always causes injury to the upper layers of the dermis; damages sweat glands, hair follicles and sebaceous glands; |
| Third Degree Burn | Complete destruction of the epidermis and dermis. |
| Fourth Degree Burn | Full Thickness Burn; insensitive to pain immediatley after injury because of the destruction of the nerve, but eventually occurs soon after. |
| Partial Thickness Burns | First and Second Degree Burns |
| Impetigo | Highly contagious condition that results from staphylococcal or streptococal infection and occurs most often in young children. Starts as a reddish discoloration, but son develops into vesicles and yellowish crusts. |
| Erythema | Reddish discoloration in skin; found with impetigo |
| Tinea | Fungal infections of the skin; ringworm, jock itch and athlete's foot. |
| Signs of Tinea | Scaling or crusting and erythema. |
| Fissures | Cracks in the skin |
| Warts | A type of benign neoplasm of the skin. Can be removed by freezing, drying, laser therapy or application of chemicals. |
| Boils | Furuncles; staphylococal infections of the hair follicles and characterized by large inflamed pustules. |
| Scabies | A contagious skin condition caused by the itch mite. Transmitted by skin to skin contact. |
| Types of Skin Infections | Impetigo, Tinea, Warts, Boils, Scabies |
| Decubitus | Pressure sores, caused by lying in one position for long periods of time. (bedsores) |
| Hives | Urticaria; common condition characterized by raised red lesions called wheals; severe itching. |
| Urticaria | Hives |
| Wheals | Raised red lesions. |
| Scleroderma | An autoimmune disease that affects the blood vessels and connective tissues of the skin; hard skin lesions. Begins as an area of mild inflammation and later develops into a patch of yellowish, hardened skin. |
| Psoriasis | Common, chronic skin disease; silvery-white scale-like plaques that remain fixed on the skin for months. |
| Eczema | Most common inflammatory disorder of the skin. Characterized by inflammation that is often accompanies by papules, vesicles and crusts. |
| Most common types of skin cancer | Squamous cell carcinoma, basal cell carcinoma, malignant melanoma. |
| Squamous Cell Carcinoma | Slow growing malignant tumor of the epidermis and is the most common type of skin cancer. Lesions are hard, raised nodules that are typically painless. May invate other organs if not treated. |
| Basal Cell Carcinoma | Usually occurs on upper face, malignancy begins in cells at the base of the epidermis. Lesions typically begin as papules that erode in the center to form a bleeding crusted crater. |
| Melanoma | Most serious form of skin cancer. Causes death in about one in every four cases. Develops from a pigmented (mole) and transforms into a dark spreading lesion. |
| ABCD rule of self examination | Asymmetry, Border, Color, Diameter |
| Kaposi Sarcoma | Rare skin cancer; first appears as purple papules, quickly spreads to the lymph nodes and internal organs. |