The cisterna magna (posterior cerebellomedullary cistern, or cerebellomedullary cistern) is the largest of the subarachnoid cisterns. It occupies the space...

which is the site for a lumbar puncture. Some major subarachnoid cisterns: Cisterna magna also called cerebellomedullary cistern - the largest of the subarachnoid...

ventricle. 1. Posterior medullary velum 2. Choroid plexus 3. Cisterna cerebellomedullaris of subarachnoid cavity 4. Central canal 5. Corpora quadrigemina...