pineal gland

Pineal gland is a small endocrine gland located near the center of the brain in between two hemispheres. Its role is to secrete melatonin hormone that regulates the sleep patterns.

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A small endocrine gland in the vertebrate brain that produces the serotonin derivative melatonin, a hormone that affects the modulation of wake/sleep patterns and seasonal functions. Its shape resembles a tiny pine cone (hence its name), and it is located near the centre of the brain, between the two hemispheres, tucked in a groove where the two rounded thalamic bodies join.

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