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.