BIOL301 Study Guide - Inferior Phrenic Arteries, Inferior Thyroid Artery, Pars Tuberalis
12 Apr 2014
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Document Summary
Endocrine system is a system of ductless glands: secrete messenger molecules called hormones. Pituitary gland (hypophysis: attached to hypothalamus by the infundibulum sits in the hypophyseal fossa (a depression of the sella turcica of sphenoid bone, secretes at least 9 major hormones, 2 basic divisions of the pituitary gland: Adenohypophysis (anterior lobe) composed of glandular tissue has 3 major divisions: pars distalis (largest), parts intermedia, pars tuberalis (wraps around infundibulum like a tube, produces hormones e. g. , growth hormone, fsh. Superior hypophyseal artery supplies entire adenohypophysis and the infundibulum. Inferior hypophyseal artery supplies the pars nervosa. Pineal gland: located on roof of the diencephalon, shaped like a pine cone special star-shaped cells called pinealocytes secrete melatonin, opaque during x-rays. Parathyroid gland: lie on posterior surface of thyroid glands, distinct organs surrounded by their own ct capsules, regulate calcium levels in body.
