The Epithalamus

  • Forms part of the roof of third ventricle.
  • The pineal gland is posterior and secretes melatonin.
  • The gland regulates day-night cycles with secondary effect in reproductive function.
  • It also produces serotonin, norepinephrine.
  • Flactuations of melanin are related related to daily cycle of photic(light) input.
  • It is connected to the suprachiasmatic nucleus of hypothalamus.
  • The habenular nuclei are sites of convergence of limbic pathways that carry impulses to midbrain.
  • They receive striae medullaris and give rise to the fasciculus retroflexus.