Pineal gland

The pineal gland is a tiny structure located at the base of the brain.
Link to graphic showing the location of the pineal and other endocrine glands (92K).
Its principal hormone is melatonin, a derivative of the amino acid tryptophan.
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pineal gland
(pin-ee-ul)
A small endocrine gland on the dorsal surface of the vertebrate forebrain; secretes the hormone melatonin, which regulates body functions related to seasonal day length.
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pineal gland: a human endocrine gland in the midbrain that regulates mating behaviors and day-night cycles.
pinocytosis: when the vesicle formed from endocytosis contains droplets of fluid.
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pineal gland A small gland located between the cerebral hemispheres of the brain that secretes melatonin.
pioneer community The initial community of colonizing species.
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pineal gland An endocrine gland located near the midline of the brain that produces melatonin, a hormone involved in biological rhythms, particularly in annual cycles.
Pineal pinea = a pine cone.
pinfeather See filoplume feather.
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It appears that the SCN takes the information on day length from the retina, interprets it, and passes it on to the pineal gland (a pea-like structure found on the epithalamus), which then secretes the hormone melatonin in response.
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[Gr. epi - on, upon; Gr. physis - growth]. An evagination of the prosencephalon (forebrain) which later forms the pineal gland.
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