habenula


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habenula

 [hah-ben´u-lah] (pl. haben´ulae) (L.)
1. any frenulum, especially one of a series of structures in the cochlea.
2. a triangular area in the dorsomedial surface of the thalamus anterior to the pineal gland. adj., adj haben´ular.

ha·ben·u·la

, pl.

ha·ben·u·lae

(ha-ben'yū-lă, -lē), [TA]
1. Synonym(s): frenulum
2. In neuroanatomy, the term originally denoted the stalk of the pineal gland (pineal habenula; pedunculus of pineal body), but it gradually came to refer to a neighboring group of nerve cells with which the pineal gland was believed to be associated, the habenular nucleus. Currently, the TA term refers exclusively to this circumscript cell mass in the caudal and dorsal aspect of the dorsal thalamus, embedded in the posterior end of the medullary stria from which it receives most of its afferent fibers. By way of the retroflex fasciculus (habenulointerpeduncular tract), it projects to the interpeduncular nucleus and other paramedian cell groups of the midbrain tegmentum. Despite its proximity to the pineal stalk, no habenulopineal fiber connection is known to exist. It is a part of the epithalamus. Synonym(s): habena (3)
[L.]

ha·ben·u·la

, pl. habenulae (hă-ben'yū-lă, -lē) [TA]
1. Synonym(s): frenulum.
2. neuroanatomy The term 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. Currently, the term, as defined by TA, refers exclusively to this circumscript cell mass in the caudal and dorsal aspect of the dorsal thalamus, embedded in the posterior end of the medullary stria from which it receives most of its afferent fibers. By way of the retroflex fasciculus (habenulointerpeduncular tract) it projects to the interpeduncular nucleus and other paramedian cell groups of the midbrain tegmentum. Despite its proximity to the pineal stalk, no habenulopineal fiber connection is known to exist. It is a part of the epithalamus.
Synonym(s): habena (3) .
[L.]
References in periodicals archive ?
Deep brain stimulation of the lateral habenula in treatment resistant major depression.
** (#) denotes P < 0.001 before and after stimulation in the insula cortex, while ** and * denote P < 0.001 and P < 0.05, respectively, between the OSA model and different stimulation frequencies in the habenula.
Washington, July 29 ( ANI ): A recent study has identified the half-pea-sized human brain portion called habenula, which tracks negative expectations like painful electric shocks and shows how bad things could get.
El autor hallo que la exposicion a los ambientes novedosos aumento la expresion de C-Fos en la corteza infralimbica, cingulada anterior, retrospenial, el hipocampo, la habenula lateral y el nucleo paraventricular del talamo.
MCs have been identified in perivascular areas of leptomeninges, hippocampus, habenula, and thalamus [143, 144] which has led to speculation of a possible contribution of these cells in regulating the trafficking of immune cells through the BBB [145,146].
But like tourists exploring a strange city without a GPS map, scientists don't know how all the neural neighborhoods are connected and occasionally encounter surprising enclaves--such as a place in the brain called the lateral habenula.
O territorio vascular da arteria cerebral caudal em graxaim-do-campo compreendeu as areas adjacentes ao percurso desse vaso sobre a superficie ventrolateral do pedunculo cerebral, o terco caudal do lobo piriforme, o coliculo rostral, a parte rostral do coliculo caudal, o corpo pineal, a estria medular, a habenula, a superficie dorsal do talamo, os corpos geniculados medial e lateral, o hipocampo, o giro para-hipocampal, os plexos corioides do terceiro ventriculo e do ventriculo lateral, o esplenio do corpo caloso, o terco caudal da face medial do hemisferio cerebral e o bordo limitante da face convexa do hemisferio cerebral em seu polo caudal.
Hypothalamic, dorsal raphe and external electrical stimulation modulate noxious evoked responses of habenula neurons.
Increasing the activity of this region, called the habenula, led to social problems in rodents, whereas decreasing activity of the region prevented social problems.
Ni et al., "Astroglial Kir4.1 in the lateral habenula drives neuronal bursts in depression," Nature, vol.
Mirrione et al., "Synaptic potentiation onto habenula neurons in the learned helplessness model of depression," Nature, vol.
They are linked by the fasciculus retroflexus, a cholinergic projection from the medial habenula to the IPN.