NROC61H3 Lecture : Chapter 15.docx
21 Apr 2012
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The hypothalamus integrates somatic and visceral responses in accordance with the needs of the brain. Homeostasis: maintaining the body within a narrow physiological range. Running in the snow: turn blue (blood to extremities), goose bumps (attempt to raise fur), Running in tropics: turn red (blood to surface to release heat), sweating (evaporation of heat) Three fnal zones: lateral, medial and periventricular. Periventricular zone: most of these cells lie next to wall of 3d ventricle. The suprachiasmtic nucleus is involved in circadian rhythms through direct retinal innervations. The pt has a posterior (pp) and anterior (ap) portion. Ht control of pp: the magnocellular neurosecretory cells are the largest neurons cells that extend their axons down the stalk of the pituitary into the pp. The scharres theorized that these could directly release neurohormones into capillaries of pt. They release two different types of polypeptides (9 aas).
