Hypoglossal nucleus

Hypoglossal nucleus
Section of the medulla oblongata at about the middle of the olive. (Hypoglossal nucleus visible top left.)
The cranial nerve nuclei schematically represented; dorsal view. Motor nuclei in red; sensory in blue. (XII labeled at bottom left.)
Details
Identifiers
Latin	nucleus nervi hypoglossi
NeuroNames	hier-754
NeuroLex ID	Hypoglossal nucleus
Dorlands /Elsevier	n_11/12581974
TA	A14.1.04.227
FMA	54505
Anatomical terms of neuroanatomy []

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.

Transverse section of medulla oblongata below the middle of the olive.

Nuclei of origin of cranial motor nerves schematically represented; lateral view.

Micrograph showing the hypoglossal nuclei in relation to their surrounding structures.

Micrograph showing the hypoglossal nucleus. H&E-LFB stain.