Rhomboid fossa

The rhomboid fossa is the shallow, diamond shaped depression on the dorsal surface of the pons and medulla oblongata thatforms the floor of the fourth ventricle . It is covered by grey matter which is continuous with the spinal cord.

It may be divided into two parts:

  • superior
    • upward triangular in shape
    • limited laterally by the cerebellar peduncles and superiorly by the cerebral aqueduct
    •  base is an imaginary line in between the superior foveae
  • inferior
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