Passage of a hollow needle through the posterior atlantooccipital membrane into the cisterna cerebellomedullaris. ... (05 Mar 2000) ... 
puncture of the cisterna cerebellomedullaris with a hollow needle inserted just between the occipital bone, in order to get a specimen of cerebrospinal fluid. See also lumbar puncture.
Type: Term Definitions: 1. passage of a hollow needle through the posterior atlantooccipital membrane into the cerebellomedullary cistern.