The lower end of the ala cinerea is crossed by a narrow translucent ridge, the funiculus separans, and between this funiculus and the clava, is a small tongue-shaped area, the area postrema.

The Area postrema, one of the circumventricular organs, detects toxins in the blood and acts as a vomit inducing center. It connects to the Nucleus of the Solitary Tract and other autonomic control centers in the brainstem.

External links

• Diagram at endotext.org
• Slide at upenn.edu

Nervous system

Area postrema