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NCI Dictionary of Cancer Terms


pineal organ  listen  (PIH-nee-ul OR-gun)

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

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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.