The vagal trigone (ala cinerea) is a triangular eminence upon the rhomboid fossa produced by the underlying dorsal nucleus of vagus nerve.
The vagal trigone is separated from the area postrema by a narrow strip of thickened ependyma – the funiculus separans.
See also Funiculus (neuroanatomy)
References
External links https://web.archive.org/web/20070927162218/http://www.ib.amwaw.edu.pl/anatomy/atlas/image_04be.htm