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Physiology

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Central Nervous System

Question
9 out of 22
 

Circadian rythm is lost in lesion of



A Ventromedial nucleus
B Supraoptic nucleus

C hypothalamic nuclei
D suprachiasmatic nuclei


Ans. D suprachiasmatic nuclei
  1. Most, if not all, living cells in plants and animals have rhythmic fluctuations in their function on a circadian cycle.
  2. Normally they become entrained, that is, synchronized to the day– night light cycle in the environment. If they are not entrained, they become progressively more out of phase with the light–dark cycle because they are longer or shorter than 24 hours.
  3. The entrainment process in most cases is dependent on the suprachiasmatic nuclei (SCN) These nuclei receive information about the light–dark cycle via a special neural pathway, the retinohypothalamic fibers.

Central Nervous System Flashcard List

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