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Brain: Epithalamus
Mesal aspect of a brain sectioned in the median sagittal plane. Epithalamus labeled in red, by 'habenular commissure', 'pineal body', and 'posterior commissure', with its projection anteriorly consisting stria medullaris
Latin epithalamus
Gray's p.812
NeuroNames hier-275
MeSH Epithalamus
NeuroLex ID birnlex_1710

The epithalamus is a (dorsal) posterior segment of the diencephalon (a segment in the middle of the brain also containing the hypothalamus and the thalamus) which includes the habenula and their interconnecting fibers the habenular commissure, the stria medullaris and the pineal body. Its function is the connection between the limbic system to other parts of the brain.


Some functions of its components include the secretion of melatonin by the pineal gland (involved in circadian rhythms), and regulation of motor pathways and emotions. It is wired with the limbic system and basal ganglia.


The epithalamus comprises the habenular trigone, the pineal body, and the posterior commissure.

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