Definition:

pineal glandlisten (PIH-nee-ul ...)

A tiny organ in the cerebrum that produces melatonin. Also called pineal body and pineal organ.

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Drawing of the inside of the brain showing ventricles (fluid-filled spaces), choroid plexus, hypothalamus, pineal gland, pituitary gland, optic nerve, brain stem, cerebellum, cerebrum, medulla, pons, and spinal cord.

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