integumentary unit

what is the top-most layer of the epidermis?

stratum corneum

what is the "basement"/deepest layer of the epidermis?

stratum basale

what forms your fingerprint?

timing of volar pad disappearance and ridge formation

what are the three types of fingerprints?

whorl, loop, and arch

where are apocrine glands located?

armpits and genital area

sudoriforous glands release…

sweat

make a transparent watery liquid called perspiration or sweat. helps to get rid of waste and maintain body temperature.

eccrine sweat glands

sebaceous glands release…

oil

Oily substance produced by sebaceous glands

sebum

near the surface of the skin, sense light touchs

meissner’s corpuscle

deep in the dermis, senses pressure and heavy touch

pacinian corpuscle

responds to pain/temperature

free-nerve ending

receives stimuli from within the body (muscle tension)

muscle spindle

largest and most exposed part of nail. the part you paint.

nail body

the base of the nail where the nail begins to grow (located deeper than the skin and cuticle)

nail root

fold of skin that hides the nail roots

cuticle

the whitish half moon shape piece that is the only visible piece of the nail root

lunula

area where cells are located beneath the nail body

nail bed

small muscle attached to each hair

arrector pili muscle

the bumps where the dermis goes into the epidermis (forms fingerprints)

dermal papilla

central part (may be absent in some hairs)

medulla

what causes goosebumps?

contraction of arrector pili muscle

single layer of cells that overlap eachother like shingles on a roof

cuticle

hair underneath the skin

hair root

the area where the hair grows and then melanocytes make color

hair bulb

hair above the skin

hair shaft

make dark skin pigment called melanin

melanocytes

stem cells in dermis

mesenchyme