PSYCH 3M03 Lecture Notes - Lecture 6: Preoptic Area, Sympathetic Nervous System, Critical Limb Ischemia

• School: McMaster University
• Department: Psychology
• Course: PSYCH 3M03
• Professor: Denys Decatanzaro

Document Summary

We avoid conditions that are too hot or too cold >> important for survival and rises to the top of the hierarchy. Temperature is sensed by cutaneous receptors in our skin and hypothalamus. Posterior nucleus of the hypothalamus is where the information arrives o o o. Increase sympathetic nervous system activity >> leads to reflexes shivering, piloection, vasoconstriction. Anterior (pre-optic) nucleus of hypothalamus: decreased sympathetic nervous system activation. Perspiration, sweating, panting, thirst, vasodilation o: decreased thyroid hormone secretion. Areas of the pre-optic area (in front of the optic chiasm) responsible for heat dissipation. If area is stimulated even at optimal temperature reflex of panting is induced in rats. Hardwired and homeostatic >> exists in humans and animals. Dogs can"t perspire through their skin like humans so they let out their heat through their mouth and tongue. Adaptive value deficiency in pain mechanism can result in damage (e. g. leprosy less cutaneous sensitivity results in tissue damage)