ANAT 322 Lecture Notes - Lecture 16: Estrous Cycle, Lesion, Sympathetic Nervous System
3 Sep 2016
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Rhythm classified by period (duration of 1 cycle) Phase: when a specific point (e. g. peak) occurs during day diff people may have shifted phases. Running wheel, records # wheel turns every few min. Higher bar more wheel turn in 5min. Dark dark cycle: still time when run & don"t run. Endogenous rhythm - circadian rhythm even when no environmental cues. But starts to run bit earlier each day. But dd: subjective night when active (nocturnal), subjective day when at rest. Zeitgeber time: #hours after lights on; zt0 = lights on. Wt: cycle keeps gets earlier when dd cycle runs on own, no longer influenced by ld cycle see endogenous cycle. Ld: time b/w onset of activity = 24h. To see endogenous period of animal, need constant conditions. Average human endogenous period is 24. 2h would get later each day. Only know free-running period in dd; because ld resets. Isolated scn in dish firing rate oscillates in 24h.
