Integumentary System & Glands of the Skin Flashcards
studying for midterm 1 (18 cards)
layers of the epidermis (superficial to deep)
stratum corneum
stratum granulosum
stratum spinosum
stratum basale
stratum corneum
forms major water barrier, determines thickness, contains keratin
stratum granulosum
contains keratinocytes
stratum basale
stem cells for skin, contains melanocytes
dermis
papillary dermis and reticular dermis
papillary dermis
loose irregular connective tissue, type I & III collagen
reticular dermis
dense irregular connective tissue, type I collagen
hypodermis (aka subcutaneous tissue)
loose irregular connective tissue, include adipose and smooth muscle cells from arrector pili muscles
adipose tissue types
white and brown adipose tissue
white adipose tissue
hormone secretion, useful for energy stores, in adults
brown adipose tissue
protects against heat lost, thermogenesis, surrounds some internal organs and in babies
keratinocytes
produces keratins for cell envelope, and lamellar bodies for lipid envelope
melanocytes
becomes melanin, which blocks UV in the skin
what is ocular albinism?
decreased # of melanosomes (only affects eye)
what is oculocutaneous albinism?
decreased number of melanosomes
-either tyrosinase (-) no melanin or (+) some melanin
nerve endings and functions
krause end bulbs: cold
meissner: light touch
merkel’s: light pressure
pacinian corpuscles: pressure and vibration
ruffini: skin stretch
free nerve ending: pain
hair follicle attachments
infundibulum: surface to sebaceous gland
isthmus: sebaceous gland to arrector pili
inferior segment: arrector pili to matrix
layers of the hair deep to superficial
medulla, cortex, cuticle, internal root sheath, external root sheath, glassy membrane
