Integumentary System

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created 6 years ago by hoovemaa
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Hair and nails notes 4 Sept 2014
Grade levels:
11th grade, College: Second year, College: Third year
Subjects:
human anatomy
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1

hair grows from

deep cells of dermis

2

hair is everywhere except

soles of feet, palms, nipples, lips, and parts of external reproductive organs

3

hair functions (3)

provide protection, movement detection, sensation

4

hair interior to exterior structure

medulla->cortex->cuticle

5

hair root

bulb below surface

6

hair shaft

hair superficial to root

7

hair follicle

space for hair

8

errector pili muscle

attached to follicle, causes hair to stand on end

9

types of hair (3)

veulls, intermediate, terminal

10

vellus hair

fine hairs on most of body

11

intermediate hair

moderately thicker hair (arms and legs)

12

terminal hair

thickest hair, found on head

13

how is hair color determined

genetics, is affected by aging and environment

14

nails grow from where?

nail root

15

where does the nail bed lie?

deep to the nail body

16

cuticle

skin fold nearest the root

17

lunula

pale crescent where blood vessels are obscured

18

free edge

closest to the tip of the digit (portion that is cut off)

19

types of glands (3)

sebaceous, sweat, and mammary

20

sebaceous glands

attached to follicle of hair, secretes sebum

21

sebum

oily substance, lubricates and waterproofs hair and skin, slows bacterial growth

22

acne

inflammed sebaceous glands

23

sweat (sudoriferous) glands

coiled tubes,

24

3 types of sweat glands

apocrine, eccrine, and ceruminous

25

apocrine sweat glands

open to the hair follicles, found in armpits and anal region, make "stinky" sweat

26

eccrine sweat glands

opens to skin, secrete water, salt, and urea, helps keep body temp down

27

ceruminous

produces earwax (or cerumen)

28

mammary glands

modified sweat glands, produce milk

29

to cool skin

blood vessels dilate to increase blood flow to surface

30

to warm skin

blood vessels constrict so less blood goes to surface, sweat glands stop secreting fluids

31

effects of aging on skin (7)

epidermal thins
loss of skin immunity
paleness of skin
glandular activity declines-dry skin
dermal blood supply decrease-cold
follicle function declines
elastic fibers decrease-wrinkling and sagging
repairs slowly