Hypoglossal nucleus

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Brain: Hypoglossal nucleus
Gray694.png
Section of the medulla oblongata at about the middle of the olive. (Hypoglossal nucleus visible top left.)
Gray696.svg
The cranial nerve nuclei schematically represented; dorsal view. Motor nuclei in red; sensory in blue. (XII labeled at bottom left.)
Latin nucleus nervi hypoglossi
Gray's p.779
NeuroNames hier-754
NeuroLex ID birnlex_2644

The hypoglossal nucleus is a cranial nerve nucleus, and it extends the length of the medulla, and being a motor nucleus, is close to the midline. In the open medulla, it is visible as what is known as the hypoglossal trigone, a raised area (medial to the vagal trigone) protruding slightly into the fourth ventricle.

In the closed medulla, the gracile and cuneate nuclei lie posteriorly, which means the nucleus is not as close to the back of the medulla as in the open medulla. It is, however, still close to the midline.

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