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Physiology

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Central Nervous System

Question
4 out of 18
 

Sleep is primarily regulated by? (AIPG 2009)



A Thalamus
B Hypothalamus

C Putamen
D Limbic cortex

Ans. B Hypothalamus
  1. The general functions of the hypothalamus are of extreme importance for the body, such as:

a. Pituitary gland regulation b. Blood pressure regulation

c. Feeding reflexes d. Thirst

e. Body temperature regulation hunger and salt cravings f. Heart rate

g. Bladder function h. Water preservation

i. Hormonal/neurotransmitter regulation j. Ovarian function

k. Testicular function l. Mood & behavioral functions

m. Wakefulness n. Metabolism

o. Sleep cycles

  1. There are 3 different sleep promoting areas for Slow wave (NREM Sleep).
  2. The diencephalic sleep zone is in the posterior hypothalamus and the nearby intralaminar and anterior thalamic nuclei..
  3. The second zone is the medullary synchronizing zone in the reticular formation of the medulla oblongata at the level of the nucleus of the tractussolitarius.
  4. Stimulation of this zone, like stimulation of the diencephalic sleep zone, produces sleep if the frequency is low but arousal if the frequency is high.
  5. The mechanism by which these effects are produced is unknown, but it presumably involves pathways that ascend to the thalamus.
  6. The third synchronizing region is the basal forebrain sleep zone. This zone includes the preoptic area (Hypothalamus) and the diagonal band of Broca

  1. The circadian rhythm is maintained by suprachiasmatic nuclei (SCN), above the optic chiasm.
  2. 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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