is the medullary part of the brain and cerebellum, joined in one; the fore part of it coming from the brain, and the hind part from the cerebellum. See Anatomy, No. 134.

It lies on the basis of the skull, and is continued through the great perforation thereof into the hollow of the vertebrae of the neck, back, and loins; though only so much of it retains the name oblongata as is included within the skull. After its exit thence it is distinguished by the name of medulla spinalis. Ibid. No. 135.