Skin
General outline
? skin is the biggest organ of the human body
? is composed of epidermis,dermis and some
accessory organs
? the function of the skin:
? barrier and protection
? sensory organ
? excrete
? body temperature regulation
? cholesterol metabolism
? absorbing some materials
Epidermis:
? keratinized stratified squamous epithelium
contains 2 cell types:
Keratinocyte
stratum basale
stratum spinosum
stratum granulosum
stratum lucidum
stratum corneum
unkeratinocyte melanocyteLangergans cell
Merkel cell
Dermis:
? located beneath the epidermis
? Reticular layer:
? Papillary layer:
a thin layer of LCT; contain capillary plexuses and
Meissner’s corpuscles
under the papillary later; consists of irregular
DCT; contain large blood vessels,accessory
organs of skin,nerve,and Pacinian corpuscles
Accessory organs of skin:
? hair
? sebaceous gland
? sweat gland