integumentary system Flashcards
(20 cards)
stratum corneum
most superficial layer; above the stratum lucidum
stratum lucidum
only present in thick skin; between stratum corneum and stratum granulosum on soles and palms of thick skin; above the stratum granulosum
stratum granulosum
beneath stratum corneum (or stratum lucidum on thick skin); above the stratum spinosum
stratum spinosum
beneath the stratum granulosum; above the stratum basale
stratum basale
deepest layer; below the stratum spinosum
hair papilla
at base of the hair; contains capillaries that supply nurients needed for hair growth
merocrine (eccrine) sweat glands
located on most of the body surface; provides cooling by excreting water, salt, and nitrogen wastes
apocrine sweat glands
located in armpits, genital areas, and facial hair on men; more common after puberty, not related to cooling
sebaceous glands
located near hair follicles; secretes oil to keep hair and skin soft and moisturized
ceruminous glands
located in the ear canal; produces earwax that protects the ear canal
mammary glands
located in the breasts; produces milk during pregnancy
arrector pili muscle
causes hair to stand and form goose bumps
melanin
pigment of the skin
lunula
portion of nail body near cuticle
keratin
tough protein of hair and nails
nail matrix
where cell division occurs resulting in hair growth
epidermis
contains keratinized stratified squamous epithelium
dermis
contains areolar and dense irregular connective tissues
hypodermis
contains mostly adipose connective tissue and some areolar connective tissue
hair matrix
where hair growth occurs
