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va·gal (nerve) tri·gone[TA]
a prominence in the floor of the inferior fovea of the fourth ventricle that overlies the dorsal motor nucleus of the vagus.
Gray triangular prominence on the floor of the fourth ventricle. The autonomic fibers of the vagus nerve arise from the cells of the nucleus of this area. Also called triangle of the vagus nerve and trigonum nervi vagi.
See also: ala