lect 14- endocrine system Flashcards
(29 cards)
how is the pituitary gland attached to the brain (hypothalamus)
by a stalk known as the infundibulum
what does the anterior pituitary form from
ectoderm of oropharynx
what does the posterior pituitary form from
neuroectoderm of the floor of the 3rd ventricle
what part of the pituitary contains the hypothalamohypophyseal tracts
infundibulum
what color do basophils and acidophils of the anterior pituitary stain
acidophils are pink; basophils are purple
what cell types are acidophils
lactotropes and somatotropes
what do somatotropes release
Growth hormone
what is the histologically most identifiable aspect of the anterior pituitary
colloid filled follicles
what are basically the astrocytes of the posterior pituitary
pituicyte
what is the role of somatostatin
inhibits secretion of growth hormone by somatotropes and insulin by beta cells
what does dopamine inhibit
secretion of prolactin
what is the most histologically identifiable attribute of the pineal gland
brain sand
what is the functional unit of the thyroid
thyroid follicle
when do the endodermal cells begin to differentiate into follicular cells
9th week
what produce thyroxine and triidothyronine
follicular cells
what produce calcitonin
parafollicular/C cells
what does the inferior parathyroid glands develop from
3rd branchial pouch
what does the superior parathyroid gland develop from
4th branchial pouch
what secretes PTH
principle/chief cells
what is the steroid secreting portion of the adrenal gland
cortex
what is the catecholamine secreting portion of the adrenal gland
medulla
what do the cortical cells of the adrenal gland arise from
mesodermal mesenchyme
what do the medullar cells of the adrenal gland arise from
neural crest cells
what do the large vesicles of the adrenal medulla secrete
norepinephrine
