The hypoglossal nucleus is a cranial nerve nucleus, found within the medulla. Being a motor nucleus, it 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.
Section of the medulla oblongata. (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.)
|Latin||nucleus nervi hypoglossi|
|Anatomical terms of neuroanatomy|
The hypoglossal nucleus is located between the dorsal motor nucleus of the vagus and the midline of the medulla. Axons from the hypoglossal nucleus pass anteriorly through the medulla forming the hypoglossal nerve which exits between the pyramid and olive in a groove called the anterolateral sulcus.
Micrograph showing the hypoglossal nuclei in relation to their surrounding structures.
- Atlas image: n2a6p2 at the University of Michigan Health System
- Stained brain slice images which include the "Hypoglossal nucleus" at the BrainMaps project
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