Hypothalamus-Pituitary (lec 21) Flashcards
Anterior Pituitary anatomy?
endocrine tissue
no nervous innervation
unique blood supply
Posterior Pituitary anatomy?
mostly nerves
Anterior Pituitary fxn?
neurocrine-released hypothal hormones ->
local circulation ->
ant pit ->
endocrine release
Posterior Pituitary fxn?
neurocrine-released hypothal hormones ->
local circulation ->
post pit vesicles ->
neurocrine release
Posterior Pituitary hormones?
Synth’d?
Neuropeptides: ADH, oxytocin
hypoth neuronal cell bodies
Posterior Pituitary hormones stored?
Transported?
vesicles
in axons
Posterior Pituitary hormones secreted?
Released?
at nerve terminals
into pituitary capillaries
ADH regulates?
Secreted when?
Acts on?
plasma osmolarity
↑ plasma osmo or hypovol
kidney
ADH action?
Results in?
DCT/CD reab H2O
↑ plasma vol
↓ osmo
↓ urine output
Oxytocin action?
Results in?
cholinergic synapse d/c oxy from post pituitary
contracts milk ducts myoepith cells -> milk letdown