Skin Path Flashcards
5 functions of human skin
protection, sensation, thermoregulation, metabolism, immunological
3 layers of skin?
epidermis, dermis, hypodermis
layers of epidermis
- Strateum corneum
- Stratum granulosum
- Stratum spinosum
- Stratum basale
major cell of epidermis?
keratinocytes
whats in Stratum corneum?
Layer of dead keratinized cells
whats in Stratum granulosum
granules. increase keratin
where is the langerham cell most prominent? role?
stratum spinousum. APC
why is the stratum spinosum so named?
Spinous processes ‘intercellular bridges’ b/w cells is visible.
what is a rete ridge?
epidermal downgrowth
what is a dermal papilla
dermal upgrowth
where are most of the accessory cells within the epidermis?
stratum basale
do dark skinned people have more melanocytes?
no they just produce more melanin
what is an apocrine sweat gland
found in axillary and genital regions.
what is keratin found in?
skin, hair nails
what are erector pilli? where are they?
smooth muscle in dermis that extend into base of hair follicle. contract when shivering
what do sebaceous glands do?
secrete oil to lubricate and waterproof hair and skin.
describe histologically an eccrine sweat gland
Lined by single layer of secretyory cells and beneath that myoepithelial cells
skin circulation?
2 main plexuses.
Papillary plexus - Beneath papillary dermis.
Cutaneous plexus- At junction of dermis and hypodermis.
where in the skin are the nerves?
dermis
where is the thickest skin
on back
what type of cell is a merkel cell?
neuroendocrine
