Anterior pontine membrane

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The anterior pontine membrane is an arachnoid membrane located anteriorly in the posterior fossa to the side of the basilar artery, separating the prepontine cistern (medially) form the cerebellopontine cistern (laterally) .

The abducens nerve (CN VI) travels within the membrane as it ascends from the pontomedullary sulcus up to Dorello's canal .