Transverse Section of Medulla Oblongata

Medulla Oblongata Spinal Tract

The spinal cord becomes the medulla oblongata, which also contains white and gray matter, but the arrangement changes, due to the embryonic expansion of the central canal to form the hindbrain vesicle, which will become the fourth ventricle. Development of the ventricle pushes dorsally situated structures more dorsolaterally. The transition is clearly seen in transverse section. The spinal cord becomes the medulla, which initially resembles the upper cervical segments. The substantia gelatinosa...