Is the avian circadian system a neuroendocrine loop?

Dec 1, 1984The Journal of experimental zoology

Is the bird daily biological clock controlled by a nerve and hormone feedback loop?

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Abstract

Avian circadian organization involves a neuroendocrine loop integrating multiple components, including the pineal gland and the suprachiasmatic nuclei (SCN).

  • The pineal gland, lateral eyes, SCN, and extraocular brain photoreceptors are key components in avian circadian rhythms.
  • The SCN inhibits pineal and ocular oscillators during the subjective day through a complex neuronal pathway.
  • During the night, melatonin secretion from the pineal gland inhibits SCN activity.
  • This proposed neuroendocrine loop synchronizes multiple oscillators and maintains stability in the circadian system.

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