Exam 1 Part 6 Flashcards Preview

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Flashcards in Exam 1 Part 6 Deck (26):
1

Integument

cutaneous membrane
largest organ in body

2

Integumentary system

skin and derivities
hair, glands, nails, sensory endings

3

derma

skin

4

functions of integumentary system

protection
hydroregulation
temperature regulation
Vitamin D synthesis
immune response
sensory reception
Excretion (oils, sweat)

5

integument tissue layers

Epidermis
Dermis
Subcutaneous (not part of the system)

6

Epidermis

ET. outer, subdivided into 4-5 structural layers
keratinized, stratifed squamous ET
most cells are dead (or dying)
airs and glands arise from epidermis that extends into dermis

7

Dermis

deeper, subdivided into 2 layers. CT

8

Subcutaneous

hypodermis. mostly fat and loose areolar CT
binds to muscle

9

Epidermal layers

Stratum basale
Stratum spinosum
Stratum granulosum
Stratum lucidum
Stratum corneum

10

Stratum basale

deepest epidermis layer
stem cells
single layer cuboidal cells on basement membrane

11

3 main types of stratum basale

keratinocytes
Melinocytes
tactile cells

12

Keratinocytes

toughened, waterproof skin
-constantly divide; migrate toward surface
cells die as keratin accumulates

13

Melinocytes

produce pigment melanin
protects against UVR -barrier over nucleus)

14

tactile cells

Merkel cells. touch

15

stratum spinosum

some cell division
immune response cells

16

stratum granulosum

keratinization begins here, immune reponse cells
often appears dakr

17

stratum lucidum

in thick skin only

18

Stratum corneum

outer most epidermal layer
cells all cornified (drid and flattened keratinized cells) are dead
especially thick on palms of hands and soles of feet
forms calluses and nails

19

dermis

irregular CT. mainly collagen and some areolar CT
cuts parallel to collagen fibers heal more quickly
deeper, thicker than epidermis
Dermal papillae

20

Dermal papillae

interface with epidermal ridges to create finger and toes prints (friction ridges)

21

Dermis also contains:

blood vessels
nerves
glands (epidermal deriviatives)
hair follicles
arrector pili muscles

22

sweat glands

sudoriferous glands

23

Tattoos are in

the dermis

24

1st degree burn

in epidermis

25

2nd degree burn

in dermis

26

3rd degree burn

in hypodermis. Bad because dehydration concern