Posterior median sulcus of medulla oblongata
The posterior median sulcus of medulla oblongata (or posterior median fissure or dorsal median sulcus) is a narrow groove; and exists only in the closed part of the medulla oblongata; it becomes gradually shallower from below upward, and finally ends about the middle of the medulla oblongata, where the central canal expands into the cavity of the fourth ventricle.This article incorporates text in the public domain from page 767 of the 20th edition of Gray's Anatomy (1918)This neuroanatomy article is a stub.You can help Wikipedia by expanding it.