pituitary gland Flashcards
mention the function of hypothalamus
synthesis of posterior pituitary hormones
control of anterior pituitary h secretions by s releasing&inhibitory h
what is the function of intermediate lobe of pituitary gland
the intermediate lobe has a role in animal .it secretes MSH . in human it is rudimentary
Supraoptic nuclei produce …………..¶ventricular n produce……………..
1.ADH
2.Oxitocin
Regulation of adenohypophysis function through………………………………
………………………………………
1- Hypothalamic control:
※ The anterior pituitary hormones are under control of the hypothalamus through releasing & inhibitory factors which are called “hypophysiotropic factors”
2- Feedback regulation
what r the types of feed-back control According to the distance between the site of hormone secrtion & site of feed-back effect
1- Ultra short loop feed-back:
↑ Hormone secreted from hypothalamus → (—) of hypothalamus.
2- Short loop feed-back:
↑ Hormone secreted from anterior Pituitary → (—) of hypothalamus.
3- Long loop feed-back:
↑ Hormone secreted from a peripheral endocrine gland → (—) of pituitary & hypothalamus.
give examples of
negative &positive feedback
1- -ve feed-back: the most common type
e.g. ↑ thyroid hormones → ↓ pituitary TSH → ↓ thyroid hormones
2- +ve feed-back: less common
e.g. ↑ estrogen → ↑ pituitary LH → further ↑ in estrogen.
Control of the hormone secretion is done through 1…………………
2………………………
3………………..
1- Feedback regulation:
A mechanism by which the endocrine system maintains constant level of any hormone in blood to maintain its optimum effect
2-neuroendocrine reflux
3- circadian rhythm