Skin, Hair, & Nails

Question 0

Epidermis

Answer 0

Thin, tough, outer layer

Stratum corneum is the exposed, top portion; constantly shed; keratinized

Stratum germinativuum is the innermost layer; constantly reproducing; melanin & keratin; forms epidermal ridges

Avascular

Skin colour based on pigments in vascular bed

Question 1

Skin layers

Answer 1

Epidermis
Dermis
Subcutaneous tissue

Question 2

Dermis

Answer 2

Connective tissue

Contains:
Collagen & elastin
Blood vessels, nerves, sensory receptors, lymphatics, some muscle
Accessory organs

Question 3

Subcutaneous

Answer 3

Hypodermis aka adipose tissue

Stabilizes skin yet allows for independent movement

Shock absorber and heat storage

Many blood vessels

Useful site for administration of drugs

Question 4

What is the function of the skin (epidermal appendages and subq)?

Answer 4

Protection
Barrier
Perception
Maintains temperature 
Identification
Communication 
Wound repair by surface cell replacement
Absorption and excretion of wastes
Vitamin D

Question 5

Hair

Answer 5

Is an epidermal appendage that is vestigial for humans

Threads of keratine

Protects, cushions

Question 6

Eccrine

Answer 6

Sweat glands over whole body

Excrete saline solution

Help with cooling the body

Sweats directly on surface of skin

Question 7

Apocrine

Answer 7

Sweat glands in axilla, areola, and perineal area primarily

Not significant in cooling

Active after puberty

Sweat onto hair follicle