The vagal trigone (ala cinerea) is a triangular eminence upon the
rhomboid fossa
The rhomboid fossa is a rhombus-shaped depression that is the anterior part of the fourth ventricle. Its anterior wall, formed by the back of the pons and the medulla oblongata, constitutes the floor of the fourth ventricle.
It is covered by a t ...
produced by the underlying
dorsal nucleus of vagus nerve
The dorsal nucleus of vagus nerve (or posterior nucleus of vagus nerve or dorsal vagal nucleus or nucleus dorsalis nervi vagi or nucleus posterior nervi vagi) is a cranial nerve nucleus of the vagus nerve (CN X) situated in the medulla oblongata ...
.
The vagal trigone is separated from the
area postrema
The area postrema, a paired structure in the medulla oblongata of the brainstem, is a circumventricular organ having permeable capillaries and sensory neurons that enable its role to detect circulating chemical messengers in the blood and tra ...
by a narrow strip of thickened
ependyma
The ependyma is the thin neuroepithelial ( simple columnar ciliated epithelium) lining of the ventricular system of the brain and the central canal of the spinal cord. The ependyma is one of the four types of neuroglia in the central nervous s ...
– the funiculus separans.
See also
*
Funiculus (neuroanatomy)
A funiculus is a small bundle of axons (nerve fibres), enclosed by the perineurium. A small nerve may consist of a single funiculus, but a larger nerve will have several funiculi collected together into larger bundles known as fascicles. Fascicl ...
References
External links
* https://web.archive.org/web/20070927162218/http://www.ib.amwaw.edu.pl/anatomy/atlas/image_04be.htm
Brainstem
{{Neuroanatomy-stub