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Notes
      3. Old stuff
          3.2. Old physio stuff (around 2005)
              3.2.3. Physiology
                  3.2.3.11. Neurophysiology
 3.2.3.11.5. Circadian rhythm 

Circadian rhythm

[Ref: WG22:p234-235]
  • Almost all cells have rhythmic fluctuations in their functions that are about 24 hours in length.
  • In the liver, the rhythm is influenced by pattern of food intake
  • In almost all other cells, the rhythms are entrained by the paired suprachiasmatic nuclei (SCN)

Suprachiasmatic nuclei

  • Above the optic chiasm
  • One on either side
  • Receive information about light-dark cycle
    * via the retinohypothalamic fibres
  • 2 different peaks of circadian activities

NB:

  • Retinohypothalamic fibres pass from optic chiasm to SCN

 

 

 

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