Supplement. In neuroanatomy, cisterns refer to any of the openings in the subarachnoid space of the brain filled with cerebrospinal fluid. Some of the major subarachnoid cisternae are: 1  cisterna cerebromedullaris or cerebellomedullary cistern. 2  cisterna pontis or pontine cistern.3  cisterna interpeduncularis or interpeduncular cistern.n neuroanatomy, cisterns refer to any of the openings in the subarachnoid space of the brain filled with cerebrospinal fluid. Some of the major subarachnoid cisternae are: 1  cisterna cerebromedullaris or cerebellomedullary cistern. 2  cisterna pontis or pontine cistern. 3  cisterna interpeduncularis or interpeduncular cistern.