Vagal trigone or vagal triangle in brain stem. Vagal triangle in the floor of fourth ventricle.

‪@DrSAMsAnatomyClasses‬ The terms vagal trigone and vagal triangle refer to the same anatomical structure in the brain stem. Also known as the ala cinerea, it is a small, triangular elevation on the floor of the fourth ventricle in the medulla oblongata. 0:00 What are the nucleus underlying vagal triangle?