skin

Question 1

Thick skin

Answer 1

epidermis is 400 – 600 microns thick

Question 2

Thin skin

Answer 2

75 – 150 microns thick

Question 3

Functions of Skin

Answer 3

Resistance to trauma and infection
Water retention
Vitamin D synthesis
Thermoregulation
Non-verbal communication

Question 4

Epidermis Cells

Answer 4

Stem cells
Keratinocytes
Melanocytes
Tactile – Merkel cells
Dendritic – Langerhans cells

Question 5

Epidermis Layer

Answer 5

Stratum basale
Stratum spinosum
Stratum granulosum
Stratum lucidum – in only thick skin
Stratum corneum

Question 6

Dermis Cells & fibers

Answer 6

Fibroblasts
Collagen - mostly
Elastic
Reticular fibers

Question 7

Dermis Characteristics

Answer 7

Dermal papillae
Epidermal ridges
Two zones
a. Papillary layer – relatively superficial
b. Reticular layer - deeper

Question 8

Tension Lines

Answer 8

Collagen fibers
- Langer lines
Wound healing consideration
The Hypodermis/Subcutaneous layer A. Superficial fascial layer
B. Subcutaneous fat

Question 9

Two forms of melanin (pigmentation)

Answer 9

Eumelanin
Pheomelanin
Dark skin – throughout
Light skin – just in str. basale

Question 10

Derivatives

Answer 10

A. Str. Corneum
Nails

Question 11

Hair - Pilus

Answer 11

Lanugo
Vellus
Terminal Hair

Question 12

Sweat Glands

Answer 12

Sudoriferous glands
Merocrine (eccrine) sweat glands
most numerous, watery secretion
Apocrine glands
found in groin, anal region axilla and areola
in mature males in the beard area
do not develop until puberty

Question 13

Sebaceous glands

Answer 13

sebum excretion onto hair follicles

Question 14

Ceruminous Glands

Answer 14

Ear – cerumen