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a small triangular area on the posteromedial surface of the thalamus at the caudal end of the medullary stria, corresponding to the underlying habenula.
Farlex Partner Medical Dictionary © Farlex 2012
A depressed triangular area located on the lateral aspect of the posterior portion of the third ventricle. It contains a medial and lateral habenular nucleus.
See also: trigone
Medical Dictionary, © 2009 Farlex and Partners