Block 3 - Integument Flashcards
part of skin that is keratinized cornified stratified squamous epithelium
epidermis
epidermis cells are called blank
keratinocytes
layer of collagenous connective tissue under skin
dermis
thick or thin skin refers to thickness of the blank
epidermis
these are most numerous in thick skin and doesnt have hair or sebaceous gland
sweat glands
not an official layer of skin and contains superficial fatty fascia
hypodermis
in thin skin, all blank strata are thinner especially blank
epidermal, stratum corneum
layer of epidermis that has a single layer of cuboidal or columnar cells
stratum basale
stratum basale has many blank between adjacent cells and blank between cell and basal lamina
desmosomes, hemidesmosomes
stratum basale has blank filaments and a blank cytoplasm
intermediate, basophilic
layer of epidermis when cells pull apart except at desmosomes, and there are increased intermediate filaments
stratum spinosum
layer layer of epidermis that contains two types of granules including keratohyalin, lamellar or membrane coating
stratum granulosum
basophilic granules rich in protein, no membrane, not exported, filaments pass through them
keratohyalin
granules seen only under EM, have membrane, are exocytosed, make lipid coating for keratinocytes
lamellar (membrane coating)
layer of epidermis that is thin white and unstained, densely packed keratin filaments, thick plasmalemma, identifiable only in thick skin
stratum lucidum
stratum lucidum is identical to blank
stratum corneum
layer of epidermis that is keratinized flat “cells”, for wear and tear, cytoplasmic sacs filled with keratin filaments in an amorphous matrix
stratum corneum
three non keratinocytes in epidermis
melanocytes, langerhans cells, merkel cells
melanocytes come from what embryo origin
neural crest cells
melanocytes resist staining and are under this layer
stratum basale
this is produced by ribosomes, transported in rough er to golgi, and incorporated into melanosomes
tyrosinase
blank is converted into melanin
tyrosine
antigen presenting cells from marrow and are phagocytes
langerhans
langerhans cells travel lymphatics to lymph node and give info to activate a blank
t lymphocyte
dendritic cells present in basal layer that are mechanoreceptors for touch
merkel
merkel cells have desmosomes that connect to blank
keratinocytes
two layers of dermis
papillary, reticular
layer of dermis immediately under epidermis and forms these projections that interdigitate with epidermal ridges (pegs)
papillary
layer of dermis that is thick bundels of dense irregular ct, running in all directions
reticular
invagination of epidermis into dermis/hypodermis, ends as a bulb in ct
hair follicle
three layers of hair follicle that undergo cornificiation
outer root sheath, inner root sheath, hair shaft
blank dissolves and disappears at level of sebaceous gland
inner root sheath
outgrowth of outer root sheath with several acini
sebaceous gland
sebaceous gland drains into blank
upper hair follicle
mode of sebaceous gland secretion
holosecretion via hair or directly onto skin in the form of sebum
mass of cells attached to hair follicle just below sebaceous gland duct
hair bulge
even if bald, blank persist but blank are not present
hair follicles, hair shaft
smooth muscle bundle from ct of hair follicle below sebaceous gland to papillary level of dermis
arrector pili muscle
goose bumps are caused by blank
arrector pili muscle
sweat glands found over most of the body and not associated with hair follicles
merocrine
cells that surround secretory part of merocrine sweat glands
myoepithelial
sweat glands that drain into hair follicles located in axilla, pubic, perineal, scrotal
apocrine
apocrine glands are blank than merocrine (eccrine)
larger
secretion of apocrine glands is odorless but this causes the odor
bacterial decomposition
skin is involved in blank synthesis with uv light which is produced by blank
vitamin 3, keratinocytes
Hair is only attached here
Bottom
Hair bulge contains blank
Stem cells
