ANSC 3080 Study Guide - Midterm Guide: Melanocyte-Stimulating Hormone, Anterior Pituitary, Posterior Pituitary

• School: University of Guelph
• Department: Animal Science
• Course: ANSC 3080
• Professor: Julie Kim

Document Summary

Pituitary is a small gland underneath the hypothalamus. Anterior lobe = major endocrine part (glandular tissue) Intermediate = major function in amphibians and fish (msh) (change color) Anterior lobe and intermediate often considered as anterior pituitary. Some project axons down the posterior pituitary lobe. Some release factors into the pituitary stalk portal venous system to feed the anterior pituitary. Endocrine cells from the anterior and intermediate pituitary release their hormones in a second capillary network. Source of beta-endorphins comes from the same gene. Msh = melanocyte stimulating hormone skin pigment. Lph ( -lipotropin): degraded to -endorphin = analgesia during stress. All derived from the common gene pomc (pro-opiomelanocortin) Releases adh and oxytocin produced in the cell body of hypothalamic neurons. Transported to the pituitary along axons in vesicles. Stored in nerve endings, until ap is fired, then released. After secretion, hormones diffuse into blood vessels. Regulates the density of aquaporins (water channels) in the distal tubule and collecting duct.