Chapter 5 - Integumentary System Flashcards Preview

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Flashcards in Chapter 5 - Integumentary System Deck (74)
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31

Subcutaneous (subQ) Layer

aka hypodermis\

not part of the skin but attaches to skin to underlying tissue 

32

The Subcutaneous Layer (and sometimes the dermis) contains?

lamellated (pacinian) corpuscles which detect external pressure applied to the skin

33

Accessory structures of the skin

include hair, skin glands nails

34

Hair 

aka?

(3) important functions 

Pili

1) protection

2) reduction of heat loss

3) sensing light tough

35

Hair 

composed of?

 

 


 

composed of dead, keratinized epidermal cells 

 

 

36

Hair consists of?

shaft - mostly projects above 

root - penetrates into dermis 

hair follicle - surrounds root of hair, made up of external & internal root sheath referred together as the epithelial root sheath 

dermal root sheath - dense dermis surrounding hair follicle

37

(3) different types of hair

1) lanugo 

2) vellus haira

3) terminal hairs

38

Lanugo

fine, non-pigmented downy hairs on body

39

Vellus hairs

replace lanugo 

short, fine, pale hairs

barely visible 

40

terminal hairs

long, course, heavily pigmented 

replace lanugo of eyebrows, eyelashes & scalf 

41

 


 

Hair color is determined by ?

the amount and type of melanin 

 

42

sebaceous (oil) glands

 connected to? 

secrete?

 

hair follicles 

oily substance called sebum

43

Sebum

an oily substance secreted by sebaceous glands to prevent dehydration of hair & skin and inhibit growth of certain bacteria 

44

(3) Types of Skin Glands

1) Sebaceous glands

2) Sudoriferous (sweat) glands 

3) Ceruminous glands

45

Sudoriferous (sweat) glands

(2) types

1) Eccrine (merocrine) sweat glands

2) Apocrine sweat glands 

46

Dermatoglyphics

the sutdy of the pattern of epidermal ridges

47

Eccrine (merocrine) sweat glands

function?

location?

 

helps to cool body by evaporating, & eliminates small amounts of wastes

distributed throughout skin of most regions especialy in skin of forehead, palms & soles 

- located mostly in deep dermis (sometimes in subQ layer

48

Apocrine sweat glands

located?

function?

located mainly in the skin of the axilla, groin, areolae
and bearded facial regions of adult males.

- their excretory ducts open into hair follicles 

- sweat secreted during emotional stress sexual excitement

49

Ceruminous Glands

what are they & where are they located?

function?

Modified sweat glands located in the external auditory (ear) canal

secretary portion lie in subQ layer, deep to sebaceous glands

Along with nearby sebaceous glands, they are involved in producing a waxy secretion called cerumen (earwax) which provides a sticky barrier that prevents entry of foreign 
bodies into ear canal.

50

Functions of Nails (3) 

1) protect distal end of digits 

2) provide support & counterpressure to palmar surface to enhance touch perception & manipulation

3) allow us to grasp & manipulate small objects + scratch & groom

51

What are Nails?

Where are they located?

 composed of hard, keratinized epidermal cells

located over dorsal surfaces of the ends of fingers & toes

52

Each nail consists of? (6) 

1) free edge 

2) transparent nail body 

3) whitish lunula 

4) eponychium (cuticle)

5) nail root

6) hyponychium (nail bed)

53

Free Edge of Nail

part of nail body that may extend past distal end of digit

54

Nail Body

aka?

(plate

transparent 

whitish lunula at its base 

comparable to stratum corneum of general epidermis 

 

55

Lunula

whitish crescent-shaped area at base of nail body (plate) 

white b/c vascular tissue underneath does not show through thickened region of epithelium 

56

Nail Root

embedded in a fold of skin 

57

Hyponychium

nail bed

thickened region of stratum corneum that secures nail to fingertip 

58

Eponychium 

cuticle

narrow band of epidermi

consists of stratum corneum

extends from & adheres to margin (lateral border) of nail wall 

- occupies proximal border

59

(2) major types of skin

1) thin (hairy) skin

2) thick (hairless) skin

60

thin (hairy) skin

covers what body regions?

 

all body regions EXCEPT palms, palmar surfaces of digits & soles