Pituitary Flashcards
hypothalamus
region of brain around 3rd ventricle; make up bottom of 3rd ventricle
pituitary
has 2 regions in humans; attached to hypothalamus
anterior pituitary
Pars Distalis = Adenohypophysis
front; epithelial cells; not electrically excitable
posterior pituitary
Pars Nervosa = Neurohypophysis
back
sella turcica
where pituitary gland resides; depression in bone at base of skull
somatotrope
GH; influences growth in children and protein metabolism in adults
lactotrope
PRL; influence activity of mammary gland and influence reproductive functions in sexes
gonadotrope
LH and FSH; influence reproduction in both sexes
thyrotrope
TSH; influence activity of thyroid gland and affects metabolic rate
corticotrope
ACTH; influence activity of adrenal cortex w/respect to reproduction of steroid cortisol
growth hormone
somatotrope
prolactin
lactotrope
LH
gonadotrope
FSH
gonadotrope
TSH
thyrotrope
ACTH
corticotrope
superior pituitary artery
branches off from middle cerebral artery; forms capillary bed at median eminence; delivering oxygenated blood to anterior
median eminence
where capillary bed is formed by SPA
pituitary portal vein
what capillary bed reforms as; forms 2nd capillary bed; carry blood to another bed
ventricles (in CNS)
fluid filled chambers in brain; transport system
magnocellular neurons
big cell body; neuron in hypothalamus; in StAR; project posterior pituitary
parvocellular neurons
small cell body; neuron in hypothalamus; project to posterior pituitary; secrete releasing factors
vasopressin
increases water reabsorption at kidney; released by increase in neurons in capillaries in posterior
oxycotin
influences smooth muscle contraction; released by increase in neurons into capillaries in posterior
hypophysiotropic factors
releasing factors; influence secretory activity of anterior
GHRH
GHRH = GH; on
SS
SS = GH; off
DA
DA = PRL; off
GnRH
GnRH = LH and FSH; on
TRH
TRH = TSH; on
CRH
CRH = ACTH; on
AVP
AVP = ACTH; on
