| habenular trigone | A small triangular area on the dorsomedial surface of the thalamus at the caudal end of the medullary stria, corresponding to the underlying habenula. Synonym: trigonum habenulae, trigone of habenula. (05 Mar 2000) |
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| trigon | 1. A figure having three angles; a triangle. 2. <astronomy> A division consisting of three signs. Trine, an aspect of two planets distant 120 degrees from each other. 3. A kind of triangular lyre or harp. A kind of game at ball played by three persons standing at the angular points of a triangle. Origin: L. Trigonum, Gr.; (see Tri-) + a corner, angle: cf. F. Trigone. Source: Websters Dictionary (01 Mar 1998) |
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| habenular | Relating to a habenula, especially the stalk of the pineal body. (05 Mar 2000) |
| habenular commissure | The connection between the right and left habenular nuclei; the decussation of fibres of the two striae medullares, forming the dorsal portion of the peduncle of the pineal body. Synonym: commissure of habenulae, habenular commissure. (05 Mar 2000) |
| habenular nucleus | The gray matter of the habenula, composed of a small-celled medial and a larger-celled lateral habenular nucleus; both nuclei receive fibres from basal forebrain regions (septum, basal nucleus, lateral preoptic nucleus); the lateral habenular nucleus receives an additional projection from the medial segment of the globus pallidus. Both nuclei project by way of the retroflex fasciculus to the interpeduncular nucleus and a medial zone of the midbrain tegmentum. Synonym: nucleus habenulae, ganglion habenulae. (05 Mar 2000) |
| habenular sulcus | A small groove located between the habenular trigone and the adjacent dorsal thalamus. (05 Mar 2000) |