Skin Derivatives

Question 1

Hair Shaft Strucutre

Answer 1

• tubular down growth of the epidermis
• sensory nerve endings surround
• follicular bulge = stem cells in hair follicle
• hair matrix = growth for hair occurs
• dermal papilla = supply blood and nerves

Question 2

Layers of Hair Root

Answer 2

Medulla
Cortex
Cuticle
Internal Root Sheath (grow up from hair matrix)
External Root Sheath (down growth of epithelium)
Glassy Membrane (BM, hair vs CT)

Question 3

Kertainization of Root Sheaths

Answer 3

• external root sheath (source of cells populate matrix)
• hair matrix cells form hair shaft + internal root sheath

Question 4

Nail Structure

Answer 4

Eponychium = cuticle
Hyponychium = nail bed joins nail (under free edge)
Nail Matrix = growth of keratin (under cuticle)
Nail Bed = epithelium under nail

Question 5

Arrector Pili Muscle

Answer 5

• control angle hair leaves dermis
• contract = goosebumps (autonomic)

Question 6

Sebaceous Glands

Answer 6

• simple branched acinar glands (1 duct)
• holocrine secretion (whole cell apoptosis)
• dump secretions into hair follicle

Question 7

Eccrine Gland

Answer 7

• simple coiled tubular glands
• merocrine secretion (signal to squeeze out duct)
• secretory = pseudo-stratified
• duct = stratified cuboidal —- through stratum corneum

Question 8

Apocrine Gland

Answer 8

• simple coiled tubular glands
• merocrine secretion
• dump secretions into hair follicle
• secretory = large lumen (store secretions)