The space between the cerebellum and medulla oblongata is called the?

• A. Cisterna magna
• B. Fourth ventricle
• C. Interpeduncular cistern
• D. Prepontine cistern

Answer: (A)

CSF-filled spaces around the brainstem, called cisterns, are important anatomical landmarks. The space between the cerebellum and the medulla oblongata is the cisterna magna, a large subarachnoid cistern located behind the medulla and beneath the cerebellum. It acts as a reservoir and conduit for cerebrospinal fluid as it moves from the fourth ventricle into the surrounding subarachnoid space. The fourth ventricle is an internal cavity within the brainstem, not the space between these structures. The interpeduncular cistern lies at the base of the midbrain between the cerebral peduncles, and the prepontine cistern is located anterior to the pons; neither is the space directly between the cerebellum and medulla.