PSL300H1 Study Guide - Final Guide: Circadian Clock, Circadian Rhythm, Cervical Ganglia
Document Summary
Scn paired structure, on either side of the. Scn is master clock: activity lowest at night, highest during the day. ***pineal body can secrete melatonin into csf and blood stream*** Rem dream episodes (same brain rhythms as waking state) - light sleep (stage 1-2) - deep sleep (stage 3-4, slow wave) cycle through these stages within period of 90 minutes (ultra-dian rhythm). 90 min rem sleep, alternates in 4 cycles with nrem sleep. Rem low amplitude, fast eegs, decreased muscle tone. Nrem sws - large amplitude , low frequency eegs. Initially light sleep cycle through eventually wake-up. Cholinergic: modbrain center supports waking pontine center supports rem sleep, activity slows progressively stage.
