Cerebrospinal fluid leaves the fourth ventricle to enter the largest subarachnoid cistern, the cerebellomedullary cistern, through which opening?
- A Median aperture, the foramen of Magendie ✓
- B Foramen of Monro
- C Interventricular foramen of the aqueduct
- D Foramen caecum
Correct answer: A. Median aperture, the foramen of Magendie
Explanation
The cerebellomedullary cistern, or cisterna magna, lies between the inferior surface of the cerebellum and the dorsal surface of the medulla below. CSF exits the fourth ventricle into it chiefly through the midline median aperture of Magendie, supplemented by the paired lateral foramina of Luschka. The foramen of Monro connects the lateral ventricles to the third ventricle, and the foramen caecum at the foramen magnum region is unrelated to CSF flow.
Reference: Gray's Anatomy for Students, 4th ed.
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