Bottom part of the brainstem. Transitions upwards into the bridge and borders downwards to
the spinal cord. At the front, the elongated marrow, on either side of the midline, exhibits two distinct elevations: an inner - the
pyramid - and an outer -
the olive. At the posterior, the medulla on either side of the midline exhibits two distinct elevations: the
inner and outer
posterior tubercles. Cranial nerves
6,
7,
8,
9,
10,
11(partially), and
12 all originate from the medulla.