anatomy ch5 -2

Created by calebsmelser 

Upgrade to
remove ads

30 terms

lanugo

delicate unpigmented hairs that covers the fetus

terminal hairs

long, course, pigmented h airs that replace lanugo on the scalp, eyebrows, and eyelids

vellus hairs

short, fine, unpigmented hairs that replace lanugo over most of the body

terminal hairs

the t ype of hair that replaced vellus hairs at puberty

shaft

portion of hair protruding above the surface of the skin

hair bulb

an expanded knob at the base of the hair root

medulla

central axis of the hair that consists of two or three layers of cells contraining soft keratin

cortex

forms the bulk of the hair; consists of cells containing hard keratin

cutible

outermost layer of the hair shaft and root, composed of a single overlapping layer of cells containing hard keratin

dermal root sheath

surrounds the epithelial foot sheath

epithelial foot sheath

layer of cells immeditely surrounding the foot of the hair

matrix

mass of undifferentiated epithelial cells inside the hair bulb that produces the hair and internal epithelial root sheath

metalocytes

produce the pigment responsible for hair color

arrector pili

smooth muscle cells that attach to the hair follicle dermal root sheath and the papillary layer of the dermis; cause hair to stand on end

sebum

white substance rich in lipids, which oils the hair and skin surface, prevents drying, and protects against bacteria

sebaceous gland

gland that opens into a hair follicle; produces sebum

merocrine sweat gland

gland that opens to the surface of the skin and secretes an isotonic fluid that is mostly water; involved with temperature regulation

apocrine sweat gland

gland that usually opens into a hair follicle; secretes an organic substance that is metabolized by bacteria to produce body odor

ceruminous gland

gland that produces ear wax

nail root

proximal portion of the nail that is covered by skin

nail fold

portion of the skin that covers the lateral and proximal edges of the nail

nail groove

holds the edges of the nail in place

eponychium

cutible; the stratum corneum of the n ail fold that grows onto the nail body

nail bed

nail root and nail body attach to this structure

nail matrix

proximal portion of the nail bed; produces most of the nail

lunula

whitish, crescent-shaped area at the base of the nail; part of the nail matrix

acne

disorder of the hair follicles and sebaceous glands that involves testosterone and bacteria

wart

viral infection of the epidermis

ringworm and athlete's foot

fungal infections that affect the keratinized portion of the skin

decubitus ulcers

disorder caused by ischemia and necrosis of the hypodermis

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

NEW! Voice Recording

Click the mic to start.

Create Set