Page 44 - Endokrin Sistem Histolojisi-Dr. Öğr. Üyesi Tuğçe Önel

The pineal gland is a

photosensitive organ and

an important timekeeper

and regulator of the day/

night cycle (circadian

rhythm).

It obtains information about

light and dark cycles from

the retina via the

retinohypothalamic tract,

which connects in the

suprachiasmatic nucleus

with sympathetic neural

tracts traveling into the

pineal gland.