Suprachiasmatic nucleus and melatonin
Which structure receives light information from the retina and regulates melatonin release from the pineal gland?
Answer D: explanation for every choice
A
The reticular formation regulates arousal and alertness.
B
The thalamus relays sensory information to the cortex.
C
The amygdala processes fear and emotional memory.
D
Correct. The SCN receives retinal input and sets the circadian clock. Darkness leads to melatonin release.
TakeawayThe SCN sets the circadian clock. Darkness triggers melatonin release from the pineal gland.
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Reviewed 2026-11-05 by a medical student. Spot an error? Report it with question ID ps40.