Hypoglossal trigone
In the upper part of the medulla oblongata, the hypoglossal nucleus approaches the rhomboid fossa, where it lies close to the middle line, under an eminence named the hypoglossal trigone.It is a slight elevation in the floor of the inferior recess of the fourth ventricle, beneath which is the nucleus of origin of the twelfth cranial nerve.This article incorporates text in the public domain from page 779 of the 20th edition of Gray's Anatomy (1918)and the Free Medical Dictionary.This neuroanatomy article is a stub.You can help Wikipedia by expanding it.