|Brain: Cisterna magna|
Diagram showing the positions of the three principal cisterns in the brain. The cisterna magna is visible at the lower right.
The cisterna magna (or cerebellomedullary cistern) is one of three principal openings in the subarachnoid space between the arachnoid and pia mater layers of the meninges surrounding the brain. The openings are collectively referred to as cisterns. The cisterna magna is located between the cerebellum and the dorsal surface of the medulla oblongata. Cerebrospinal fluid produced in the fourth ventricle drains into the cisterna magna via the lateral apertures and median aperture.
Cerebral spinal fluid can also be obtained by puncture of the cisterna magna (cistern puncture).
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