Pineal Gland
It
is a stalked small rounded gland found behind the anterior choroid plexus on
the epithalamus.
Calcification
occurs in middle age. It has pineal and glial cells
.
Hormones
The
gland secretes two biogenic amine hormones
(i)
Serotonin: Also by disintegrating blood cells. Constricts
(Vasoconstriction) blood vessel at
site of injury and gives burning sensation.
(ii)
Melatonin:. The hormone develops pale skin color in amphibians.
It shows a marked diurnal
rhythm with maximum concentration at midnight and minimum during noon. The
hormone controls sleep, mood, ovarian cycle, delays puberty, opposes FSH and LH
hormones (hence anti-gonadotrophic).
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