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 ?
Using a Cryo Cut CM3050 (Leica, Bensheim, Germany), sections of 10 [micro]m thick were cut in the plane of the nucleus habenulae.
Milena Kemali was a skillful neuroscientist who focused on the frog brain, identifying, among other findings, an asymmetry of the habenulae that has inspired debates on the evolution of lateralization in the brain.