cerebellomedullary cistern great cistern neuronames:542 BAMS:cmcis FMA:74517 BAMS:GrCi UBERON:0004049 EMAPA:37814 The largest of the subarachnoid cisterns between the cerebellum and the medulla oblongata; it is divided into a posterior cerebellomedullary cistern located between the cerebellum and the posterior surface of the medulla (also called cisterna magna), and a lateral cerebellomedullary cistern located between the cerebellum and the lateral aspect of the medulla. subarachnoid cistern