earlier studies in rat have established that the photic signals originating in the retina pass via the retinohypothalamic tract to the suprachiasmatic nucleus , to the tuberal hypothalamus , over medial forebrain bundle , reticular formation , and upper thoracic interomediolateral cell column to the superior cervical ganglion , whose postganglionic sympathetic fibers , traveling along the tentorium cerebelli , enter the pineal gland via the conarian nerve .
C0038866
suprachiasmatic nucleus
C0020663
hypothalamus