endocrine and exocrine glands
type of secretion in mammary glands
apocrine-lipid secretion; merocrine-protein secretion
define apocrine secretion
budding off of membrane-encased particles
formation of exocrine glands
cell proliferation- into ECM- CT surrounds glands- stem becomes conduit and bud differentiates into the secretory unit
formation of endocrine glands
cell proliferation- invasion into ECM- CT surrounds glands- stem undergoes apoptosis and bud differentiates into secretory unit- isolated bud becomes vascularized
coiled exocrine secretory region
coiled
tubulo-acinar exocrine secretory region
combinations
type of secretory portion in mammary gland
compound tubuloalveolar (tubuloacinar) and branched ducts; secretory regions can be either acinar or tubular
location of sebaceous glands
embedded in the dermis alongside hair follicles
function of myoepithelial cells
exocrine glands; embrace secretory or duct cells
define merocrine secretion
exocytosis or protein or glycoprotein containing vesicles; most common
location of intralobular ducts
half dozen around perimeter; little ECM
type of secretion in sebaceous glands
holocrine
4 parts in pancreatic duct network
intercalated ducts, intralobular ducts, interlobular ducts, main ducts
endocrine cells in the pancreas
islets of langerhans
type of secretion in compound acinar glands in pancreas
merocrine; release zymogen granules
define holocrine secretion
release and subsequent disintegration of entire cells
acinar exocrine secretory region
round or globular
what do sebocytes release
sebum
define endocrine glands
secrete components into the blood (hormones
function of alpha cells
secrete glucagon, 20%, periphery
function of beta cells
secrete insulin, central, 75%
function of gamma cells
secrete somatastatin, periphery, 5%
define exocrine glands
secretes components outside the body, digestive enzymes, tears, milk
structure of sebaceous glands
simple branched acinar glands
location of myoepithelial cells
sweat glands, lacrimal glands, salivary glands, mammary glands
tubular exocrine secretory region
tube, short, long, or coiled
branched exocrine secretory region
two or more branches
compound exocrine ducts
two or more branches in the duct
simple exocrine ducts
unbranched duct