The anterior commissure is divided into an anterior and a posterior bundle when traced laterally, and the posterior half passes underneath the lentiform nucleus of the basal ganglia.
The posterior commissure of the larynx is a name often given to the posterior portion of the glottis. The interarytenoid muscles are part of this anatomical landmark.
The anterior commissure is located in the anterior wall of the third ventricle at the upper end of the lamina terminalis. It runs across the midline in front of the anterior columns of the fornix, above the basal forebrain and beneath the medial and ventral aspect of the anterior limb of the internal capsule.This diagram with labels depicts and explains the details of Posterior Commissure 300×190.