pituitary gland Flashcards
what type of hormones are released from hypothalamus?
neurohormones - bc hypothalamus is made up of neural tissue
name of pituitary stalk
infundibulum
location of pituitary
pocket in spheroid bone - sella turcica
2 lobes of pituitary
anterior and posterior
how do hormones get from hypothalamus to ant pituitary?
via portal system
what cells are found in the post pituitary?
collection of axons - cell bodies are in hypothalamus
what is MSH and where is it produced?
melanocyte stimulating hormone - produced in the pars intermedia
which lobe is larger (2/3) and glandular?
anterior
what type of cells does the anterior pit originate from?
epithelial origin
what type of cells does the posterior pit originate from?
neural tissue origin
what is a tropic hormone?
governs the release of another hormone
what is a non-tropic hormone?
hormone with no intermediate hormones involved
tropic and non-tropic are what type of hormones?
hypothalamic
where do tropic hormones travel to?
from hypothalamus to ant pituitary via axons of hypothalamic neurons
where do non-tropic hormones travel to?
from hypothalamus to post pituitary
how is the hypothalamus connected to the post pituitary?
via axons which project down the infundibulum
hormones released posterior pituitary?
vasopressin - maintains water balance
oxytocin - stimulates uterine contraction and lactation
role of magnocellular neurons?
in post. pituitary, synthesises ADH and oxytocin
which type of hormones are hypothalamic hormones?
all peptides - except dopamine (AMINE)
5 hypothalamic releasing hormones? (TROPIC)
TRH CRH GHRH GnRH PRH
2 hypothalamic inhibiting hormones? (TROPIC)
GHIH
PIH
what is the hypothalamus-hypophyseal portal system?
network of vessels which transfer tropic hormone from hypothalamus to anterior pituitary
5 anterior pituitary hormones which are tropic?
FSH LH GH ACTH TSH
1 anterior pituitary hormone - non-tropic?
Prolactin
