PHGY 209 Lecture Notes - Lecture 9: Reticular Formation, Mesolimbic Pathway, Alpha Motor Neuron
13 Dec 2017
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Document Summary
When you sleep you go through stages 1-4 of nrem, and then you enter rem. Increased inhibition of skeletal muscle (low muscle tone, but twitching can occur) Except for the muscles that come relax, you"re seem to become more alert, when in fact you"re deeply asleep in rem. Because muscles become really relaxed during rem, for some people the muscles around the thong become so relaxed that the thong falls back and you stop breathing. The physiological response of the body is to wake up, and therefore people cannot go into rem sleep. If people don"t go into rem they do not have a very good night of sleep. When you get older you go less often into rem. The reticular activating system in the brainstem and the hypothalamus are responsible for controlling the circadian rhythm. The reticular activating system and the hypothalamus are pushing you back and forth to wake and asleep using the release of certain neurotransmitters.
