Ch 5 pt 1 Flashcards
integumentary system
skin and its derivatives
epidermis
outermost protective shield of the body; composed of avascular, keratinized stratified squamous epithelium
cells of the epidermis
keratinocytes, melanocytes, langerhan’s cells, Merkel cells
location of stratum corneum
outermost layer
structure of stratum corneum
20 to 30 layers of DEAD keratinized cells
function of stratum corneum
PROTECTION
location of stratum lucidum
present ONLY in thick skin
Structure of stratum lucidum
thin, translucent band of clear, flat, DEAD keratinized cells
structure of stratum granulosum
3 to 5 layers of LIVING cells; keratinocytes accumulate granules
structure of stratum spinosum
several LIVING cell layers containing web-like system of filaments, melanin granules, and langerhan’s cells
location of stratum basale
deepest epidermal layer; firmly attached to the dermis
structure of stratum basale
single row of the youngest LIVING keratinocytes; contains melanocytes and Merkel cells
function of stratum basale
highly mitotic
dermis
second major skin region
components of the dermis
- strong, flexible, Fibrous connective tissue
- highly innervated and vascuarized
- hair follicles, oil sweat glands
cells of the dermis
typical connective tissue cells
layers of the dermis
papillary layer and reticular layer
papillary layer
thin, superficial layer of highly vascular areolar connective tissue; responsible for fingerprints
reticular layer
deeper layer of dense irregular connective tissue
location of the hypodermis
subcutaneous layer deep to the skin
structure of the hypodermis
mostly adipose tissuef
function of the hypodermis
stores fat
melanin
yellow to reddish-brown to black pigment; individual and racial differences in skin coloring reflect the kind of amount of melanin made
