Integumentary System

stratum granulosum

layer containing sacs filled with fatty material or keratin subunits

Which two body areas tested were most sensitive to touch?

lips, fingertips

dermis

major skin area where derivatives (nails and hair) reside, has abundant elastic and collagenic fibers

stratum corneum

most superficial epidermal layer, accounts for most of the epidermis

Four Protective Functions of the Skin:

protection from mechanical damage chemical damage thermal damage bacterial damage

collagen

protein, that makes the dermis tough and leatherlike

melanocytes

specialized cells that produce the pigments that contribute to skin color

papillary layer

the more superficial dermis layer

Layers of the epidermis (deep to superficial)

Basale Spinosum Granulosum Lucidum (think, hairless skin) Corneum

epidermis

avascular region

Which two body areas tested were the least sensitive to touch?

back of calf, back of neck

epidermis

composed of keratinocytes

skin

composed of two basic tissue, dense connective tissue, making up the dermis and epithelium, forming the epidermis

stratum corneum/lucidum

dead cells

adaptation of sensory receptors

decline in receptor sensitivity and stimulation with prolonged unchanging stimuli

stratum basale

epidermal region exhibiting the most mitoses, region where melanocytes are most likely to be found

About the dermis

has a rich nerve supply; some with nerve endings that respond to pain. If these bare nerve endings are stimulated by injection, a pain message will be transmitted to the central nervous system for interpretation.