Hypoglossal triangle

Caudally the hypoglossal nucleus forms the hypoglossal triangle lying close to the median plane and the dorsal nucleus of the vagus forms the vagal triangle, situated just lateral to the hypoglossal triangle.

Fourth ventricle floor: fc: facial colliculus; ht: hypoglossal triangle; if: inferior fovea; me: medial eminence; ms: median sulcus; o: obex; sf: superior fovea; sl: sulcus limitans; sm: medullary striae of fourth ventricle; vt: vagal triangle.