Medulla oblongata (animation). Medulla and parts (10-16) - (10) pyramid; (11) the anterior median fissure; (15) is the choroid plexus in the fourth ventricle; (13) olive and (7) the pons. Medulla-animated as it protrudes from the foramen magnum of the skull-base, after which it gives rise to the spinal cord. The medulla can be thought of as being in two parts: 1  an upper open part or superior part where the dorsal surface of the medulla is formed by the fourth ventricle.
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