Rodgersia

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.

Additional images

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  Fourth ventricle. Posterioe view.Deep dissection.

References

This article incorporates text in the public domain from page 767 of the 20th edition of Gray's Anatomy (1918)