Suprachiasmatic nucleus

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Contents

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Broader Terms

hypothalamus

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Related Terms

biological clock

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Scope Note

small group of nerve cell bodies in the supraoptic region of the hypothalamus, just above the optic chiasm; influences rhythmic aspects of hypothalamic functions in many vertebrate species.

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Facts (generated by robot; please edit if you find it inaccurate)

  • The rat suprachiasmatic nucleus is a clock for all seasons.
  • A subpopulation of efferent neurons in the mouse suprachiasmatic nucleus is also light responsive.
  • Homer-1 mRNA in the rat suprachiasmatic nucleus is regulated differentially by the retinohypothalamic tract transmitters pituitary adenylate cyclase activating polypeptide and glutamate at time points where light phase-shifts the endogenous rhythm.
  • Photic induction of Fos in the hamster suprachiasmatic nucleus is inhibited by baclofen but not by diazepam or bicucullin.
  • The rat suprachiasmatic nucleus is a clock for all seasons.
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