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.]

habenula

/ha·ben·u·la/ (hah-ben´u-lah) pl. haben´ulae   [L.]
1. a frenulum, or reinlike structure, such as one of a set of structures in the cochlea.
2. a small eminence on the dorsomedial surface of the thalamus, just in front of the posterior commissure.haben´ular

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.]

habenula

pl. habenulae [L.]
1. any frenulum, especially one of a series of structures in the cochlea.
2. a triangular area in the dorsomedial aspect of the thalamus rostral to the pineal gland.
References in periodicals archive ?
In the study, the researchers then used a combination of different techniques to map the connections from the habenula to the frontal area of the brain, and to precisely control the activity of neurons in these regions.
The medial habenula consists mostly of dense cells, and lateral habenula consists of more loosely arranged cells [25].
The take-home of this study is that inhibition in this pathway is coming from an unusual co-release of neurotransmitters into the habenula," Shabel said.
The research has shown that the habenula got activated in response to pictures associated with painful electric shocks, with the opposite occurring for pictures that predicted winning money.
There's lots of new research showing that an overactive habenula has behavioral effects," says neuropharmacologist Martine Mirrione of Brookhaven National Laboratory in Upton, N.
University of Utah neuroscientists report that when a region of the brain called the lateral habenula is chronically inactivated in rats, they repeatedly drink to excess and are less able to learn from the experience.
In the proposed project we will explore the function and the architecture of neural circuits that are involved in olfactory and gustatory information processing, namely habenula and brainstem.
In experiments on hamsters, the antibody revealed thin nerve connections running from pineal cells to the regions called the posterior commissure and the habenula.
Intriguingly, salience experience alters the activity in the medial globus pallidus of the basal ganglia and the lateral habenula (LHb) as well as in dopamine and serotonin neurons.
25 ( ANI ): Researchers have claimed that the lateral habenula - one of the oldest regions of the brain, evolution-wise - a region of the brain linked to depression and avoidance behaviors, has been largely misunderstood and may be integral in cost-benefit decisions.
NERF-scientists demonstrate that the habenula, a specific part in our brain consisting of neural circuits, acts as a gate for sensory information, thus regulating behavior in response to external stimuli.
Researchers were also able to produce the opposite effect - reduced effort in response to challenge - by stimulating prefrontal neurons that project to the lateral habenula, a region perched atop the brain stem that is thought to play a role in depression.