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Integumentary System
Body Functions Chapter 8 Page 171
Question | Answer |
---|---|
The integumentary system is made up of: | 1. Skin. 2. Hair. 3. Nails. 4. Sebaceous glands (sebum - oil). 5. Cerumenous glands {cerumen (earwax)}. 6. Sudoriferous glands (sweat). |
The skin: | 1. Is flexible. 2. Is waterproof. 3. Protects the body from ultraviolet (UV) light. 4. Protects the body from many chemicals and microbes. 5. Regulates body temperature (evaporation). |
The outermost layer of skin is called the | epidermis. |
The epidermis is composed of | epithelial cells. |
Epithelial cells reproduce by | mitosis (30,000/day). |
Newer epithelial cells push upward where they slowly | necrose (die). |
This process is called | keratinization. |
These keratinized cells are constantly being | sloughed |
Skin sloughing (shedding) helps rid the body of | pathogens (disease producers). |
The second layer of the skin is called the | dermis AKA corium. |
The dermis (corium) consists of | connective tissue (collagenous + elastin fibers). |
The function of collagen is to | bind skin cells together. |
Embedded in the dermis (corium) are: | 1. Blood vessels. 2. Nerves. 3. Lymph vessels. 4. Hair follicles. 5. Sebaceous glands (sebum). 6. Sudoriferous glands (2-4 million sweat glands). |
Sweat is released through ossa called | sudoriferous pores. |
The next layer of the skin is called the | subcutaneous (subQ or subcu) AKA hypodermis. |
The subcutaneous tissue (hypodermis) consists mainly of | adipose tissue (fat). |
The subcutaneous tissue (hypodermis) attaches the | dermis (corium) to the underlying muscles. |
The fibrous connective tissue of the body is called | fascia |
When skin is subjected to an excessive amount of abrasion or friction, a thickened area develops called a | callus (calluses). |
Skin pigmentation (color) is genetically determined by the amount of | melanin produced. |
A genetic mutation causing an absence of melanin production is called | albinism. |
Dilation of the blood vessels in the dermis (corium) causes | erythroderma AKA erythema AKA rubeosis. |
Causes of erythema include: | 1. Pyrexia (fever). 2. Hypertension (HTN). 3. Inflammation. 4. Blushing. |
A bluish discoloration of the skin caused by hypoxia or hypothermia is called | cyanosis (cyanotic). |
Excessive hemolysis of erythrocytes or hyperbilirubinemia causes a yellowish orangish discoloration to the skin and/or sclerae (white part of each eye) called | xanthoderma or jaundice or icterus (kernicterus). |
Hair is a characteristic of all | mammals. |
On humans, hair can be found on the entire body except for the: | 1. Palms. 2. Soles. 3. Glans penis. |
The average human produces | 7 miles of hair/year. |
Each hair is composed of: | 1. A shaft. 2. A root. 3. A follicle. |
A shaft is the | visible portion of the hair. |
A root is found in the | epidermal tube. |
A follicle is where | mitosis occurs. |
Attached to each hair follicle is an arrector pili muscle which causes the hair shaft to | “stand on its end” causing a “goose flesh” appearance when we get scared or cold. |
Genetics will control: | 1. Hair color. 2. Hair texture. 3. Hair loss (alopecia). |
The visible part of a nail is called a | nail body. |
The part of a nail that grows is called a | nail bed. |
The base of a nail is covered by tissue called a | cuticle AKA eponychium. |
onychocryptosis | an abnormal condition of an ingrown (hidden) nail |
onychomycosis | an abnormal condition of a nail(s) caused by fungus |
paronychia | a condition of inflammation adjacent to a nail |
cicatrix (cicatrices) | scar(s) |
keloid | an exaggerated or hypertrophied scar |
Keloids are associated with | surgery and 3rd degree burns. |
ulcer | an erosion (wearing away) of the skin or mucous membrane |
Decubitus ulcer is AKA | bedsore or pressure sore (ulcer). |
Decubitus ulcers commonly occur on bony prominences (pressure points) such as: | 1. Coccyx (tailbone). 2. Calcanei (heel bones). 3. Olecranons (Holy Crayon) {elbows}. 4. Scapulae (shoulder bone). 5. Occipital bone (posterior base of the cranium {skull}). 6. Pelvis (ilia and ischia). |
Ecchymosis (ecchymotic) | black + blue mark caused by bleeding under the skin AKA hematoma or contusion or bruise |
edema (edematous) | tissue swelling caused by an accumulation of fluid |
pitting edema | fluid accumulation where indentations occur after light palpation |
eschar(otic) | necrotic tissue caused by a burn |
macule (macular) | flat usually erythematous skin lesion |
papule (papular) | a raised skin lesion < 1cm |
nodule (nodular) | a raised skin lesion > 1cm |
nevus (nevi) | mole(s) or birthmark(s) |
petechia(e) | pinpoint skin hemorrhage(s) |
purpura (happy cat) | a combination of ecchymosis and petechiae |
pustule (pustular) | a papule filled with pus |
abscess (abscesses) | a collection of pus |
verruca(e) | wart(s) |
pallor | paleness |
vesicle | a raised lesion filled with a clear liquid AKA a blister or bulla (> 1cm) or bleb (< 1 cm) |
abrasion | mechanical superficial damage to the skin AKA “scrape” |
excoriation | chemical superficial damage to the skin such as “diaper rash” |
cellulitis (dermatitis) | inflammation of skin cells |
urticaria | hives AKA wheals |
Urticaria | an indication of an allergic reaction. |
cyst | a thickening or lump |
furuncle | an infection of a hair follicle and adjacent tissue AKA a boil |
carbuncle (car load) | a cluster of furuncles |
gangrene (gangrenous) | putrefaction (rot) caused by tissue necrosis and microbial proliferation |
laceration | tissue that is cut, torn, or ripped |
avulsion | tearing any part of the body away from the whole |
xeroderma | dry skin |
ichthyosis | dry scaly skin |
crustation(s) | scab(s) |
vitiligo (Michael Jackson) | localized loss of skin pigmentation characterized by milk-white patches |