Anatomy and Cell Biology 3319 Lecture Notes - Lecture 5: Anterior Pituitary, Pars Tuberalis, Pars Intermedia

• School: Western University
• Department: Anatomy and Cell Biology
• Course: Anatomy and Cell Biology 3319
• Professor: Martin Sandig

Document Summary

Suggested reading: pawlina 7th ed. p. 745 755 (6th ed. p. 742 752) Sits in the sella turcica of the sphenoid bone. The remaining epithelial cells that face away from the nervous portion are called the pars distalis: epithelial cells detach themselves from the mouth. Hypothalamus contains neurons whose axons travel into the pituitary or release hormones to regulate the pituitary: paraventricular nucleus, supraoptic nucleus, hypothalamo-hypophysiotropic nucleus. Posterior lobe = neurohypophysis: pars nervosa contains neurosecretory axons and endings, infundibulum connects the pituitary to the hypothalamus; neurosecretory axons travel through. Anterior lobe = adenohypohysis: pars distalis, pars intermedia sandwiched between the pars distalis and pars nervosa, pars tuberalis wrapped around the infundibulum. Hypothalamo-hypophysiotropic neurons secrete releasing and inhibitory hormones that regulate secretions from the pars distalis. Pars distalis secretes: adrenocorticotropic hormone, thyroid stimulating hormone, follicle stimulating hormone, luteinizing hormone, growth hormone, prolactin. Paraventricular and supraoptic neurons produce antidiuretic hormone and oxytocin.