Module 1: Basic tissue types: Glands Flashcards
exocrine glands (all cards are exocrine unless stated)
via ducts, the gland secretes to the surface
ex. sweat gland
duct arrangements
unbranched in simple glands
branched in compound glands
shape of secretory units
tubular
acinar/alveolar: sac like secretory units
tubuloacinar: combination of tubules and acinar
types of secretions
serous: watery, may contain enzymes
mucous: produce mucous (viscous glycoproteins)
mixed: produce a mixture of the two
discharge of secretory products
merocrine (eccrine) glands: vesicles fuse with cell membrane to discharge products; abundant in thick skin
apocrine glands: similar to eccrine glands; found in axillae, breasts, pubic, perineal regions; only secrete after puberty
holocrine: whole secretory cell is discharged and then disintegrates to allow release of product; primarily in sebaceous glands
simple tubular
single, straight tubular lumen
glands of the large intestine
simple coiled tubular
single, tightly coiled lumen
sweat glands
simple branched tubular
several tubular portions drain into a single unbranched duct
glands of the pyloric region of the stomach
simple acinar
occurs as pockets in epi surfaces and are lined by secretory cells
mucous-secreting glands of the urethra
simple branched acinar
several secretory acini that empty into a single excretory duct
sebaceous glands
compound tubular
the secretory portion is tubular (branched or coiled) and secretes into a branched duct system
Brunner’s gland of the duodenum
compound acinar
the secretory units are acinar in form and drain into a branched duct system
exocrine pancreas
compound tubuloacinar
the secretory units are a mixture of compound tubular and acinar
salivary glands and prostate glands
ENDOCRINE glands
clumps of secretory cells surrounded by blood capillaries
ductless and secretes hormones directly into the circulatory system
Release of hormones into intercellular spaces that rapidly diffuse into surround capillaries
Ex. pituitary and adrenal glands
pancreas
a gland that is both exocrine (acini) and endocrine (Islets of Langerhans)
