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Habenula
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Habenula : ウィキペディア英語版
Habenula

In neuroanatomy, habenula (diminutive of Latin ''habena'' meaning rein) originally denoted the stalk of the pineal gland (pineal habenula; pedunculus of pineal body), but gradually came to refer to a neighboring group of nerve cells with which the pineal gland was believed to be associated, the habenular nucleus. The habenular nucleus is a set of well-conserved structures in all vertebrate animals.〔Andres, KH; During MV, Veh RW (1999). "Subnuclear organization of the rat habenular complexes.". Journal of Comparative Neurology 407 (1): 130–150. . PMID 10213193〕
Currently, the Terminologia Anatomica term refers exclusively to this separate cell mass in the caudal and dorsal aspect of the dorsal thalamus (the epithalamus), embedded in the posterior end of the medullary stria from which it receives most of its afferent fibers. By way of the fasciculus retroflexus (habenulointerpeduncular tract) it projects to the interpeduncular nucleus and other paramedian cell groups of the midbrain tegmentum.
The habenula receives input from the brain via the stria medullaris thalami and outputs to many midbrain areas involved in releasing neurotransmitters, such as dopamine, norepinephrine, and serotonin.
==Anatomy==

The habenula was traditionally divided into lateral (limbic) and medial (motor) parts. Detailed examination of the region in the cat, however, suggested that the lateral part should be further divided into ten distinct subnuclei and the medial into five distinct subnuclei.〔Iwahori, N (1977). "A Golgi study on the habenular nucleus of the cat.". Journal of Comparative Neurology 72 (3): 319–344. PMID 319124〕

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