Chapter 5 Flashcards
Epidermis
Outer layer of skin
Dermis
Inner layer of the skin
Subcutaneous layer/hypodermis
underneath dermis, attaches the skin to underlying adipose tissues and organs
Keratinocytes
produce keratin
Keratin
a tough fibrous protein that provides protection
Melanocytes
produce pigment melanin
Intraepidermal macrophages
Involved in immune response
Tactical epithelial cells
functions in the sensation of touch
4/5 layers of epidermis
stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, stratum corneum
Stratum basale
single layer of cuboidal or low columnar cells sitting on the basement membrane
stratum spinosum
several layers of keratinocytes thick
Stratum granulosum
3 to 5 layers of flat keratinocytes
stratum lucidum
thin translucent zone seen only in thick skin
stratum corneum
up to 30 layers of dead, scaly, keratinized cells
Dendritic langerhans cells
macrophages
Thin skin
hairy. covers all body regions except the palms, palmar surfaces of digits and soles
Thick skin
no hair. covers palms, palmar surfaces of digits and soles
Dermis
composed of connective tissue containing collagen and elastic fibers
papillary region
Part of the dermis. Lies just below the epidermis
Reticular region
Part of dermis. Consists of dense irregular connective tissue