PSYC 3 Lecture Notes - Lecture 18: Lateral Hypothalamus, Reticular Formation, Ghrelin
Document Summary
Cannot approach or eat food (experiment fed) Originally vmh is thought to regulate lh. Mch and orexin neurons in the lh induce eating and changes in metabolic rate. Low glucose and ghrelin release cause eating. Gets all the info, but lh is conductor. Its job is to activate the ans. Leptin fat signal (if high then have lots of fat so tells arcuate to shut off. Responsive to ghrelin released by the stomach when its hungry also effects arcuate by turning on those neurons. Responsive to glucose, which then triggers the arcuate and so on Npy/agrp neurons in the arcuate activate the mch and orexin neurons in the. Lh and also activate the pvn to stimulate eating and increase parasympathetic activation. Pyy released by the gastrointestinal tract just after a meal, inhibits orexigenic. Cart/alpha-msh neurons in the arcuate inhibit the lh and pvn to stop eating and increases parasympathetic activation, reduce sympathetic.
