Integumentary System Flashcards
Eccrine Sweat Glands
- simple, coiled, tubular gland
- abundant on palms, foreheads, soles of feet
- connect to pores
- NOT SMELLY (99% water)
Follicle
- tube-like pocket in skin and scalp
- contains the hair root
Medulla
- inner most layer of hair
Hair bulb
- fat end of hair
- the lowest part of the hair root
Hyponychium
the skin between the free edge and fingertip
Functions of Integumentary System
Protection, sensation, excretion, temperature regulation, vitamin D production
Parts of System
Nails, Skin, Hair, Glands
Keratinocytes
- most abundant epidermal cells
- produce keratin (protects skin)
Melanocytes
- cells that produce melanin (skin pigment)
Langerhans cells
- epidermal macrophages that activate the immune system
Merkel cells
- light touch receptors
Eumelanin
- brownish-black pigment
mnemonic:
EW-melanin
Melanin
- pigment of skin
Pheomelanin
- reddish-yellow pigment
mnemonic:
THEOmelanin (ginger-red)
Keratin
- hard protein in epidermis, hair, and nails
Stratum Corneum
- outer layer of epidermis
- consists of flattened keratinocytes
Stratum Lucidum
- translucent
- found in soles of feet and palms (thick skin only)
mnemonic:
transLUCent
LUCidum
Stratum Granulosum
- thick layer
- transition between active cells and dead cells
Stratum Spinosum
- gives flexibility and strength to the skin
Stratum Basale
- rapid cell division occurs here
mnemonic:
BASE-ale (bottom)
Epidermis
Outermost layer of skin
- avascular
Dermis
Thickest (middle) layer of skin
- vascular
- where tattoos are put in
- papillary layer that makes thumb prints
Hypodermis
- subcutaneous layer
- vascular
- made up of adipose and areolar tissue
- connects skin to muscle
- elastic
- atrophies with age