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. 2022 Feb;43(2):167–175. doi: 10.3174/ajnr.A7309

FIG 7.

FIG 7.

Illustration of arachnoid membranes and the CSF flow at the level of the interpeduncular and prepontine cisterns in the coronal (A) and sagittal (B) planes. The CSF enters the prepontine cistern from the cerebellomedullary and the premedullary cisterns. It runs superiorly within the prepontine cistern and enters the interpeduncular cistern. From there, the CSF can flow laterally and anteriorly into the chiasmatic cistern or posteriorly into the ambient cisterns. The numbers represent the following: 1) diencephalic leaf of the LM; 2) medial attachment of the mesencephalic leaf of the LM; 3) lateral attachment of the mesencephalic leaf; 4) anterior pontine membrane; 5) medial pontomedullary membrane; 6) lateral pontomedullary membrane. AC indicates ambient cisterns; CC, chiasmatic cistern; CM, cerebellomedullary cistern; CP, cerebellopontine cistern; IP, interpeduncular cistern; MB, mammillary bodies; PM, premedullary cistern; PP, prepontine cistern. Reproduced with permission from Frank Gaillard and Radiopaedia.org. Copyright (2021) Radiopaedia.