The interpeduncular fossa is a lozenge-shaped area. It is bound by the optic chiasm in front, the pons behind, the optic tracts of the crura cerebri on the anterolateral side, and the cerebral peduncle posterolaterally. It contains the tuber cinercum, corpus albicans, the intradural portion of the infundibulum, the posterior perforated space, and the occulomoter nerves. All of these structures except for the occulomoter nerves form the floor of the third ventricle except for its anterior portion.

Fossa interpeduncularis

Recessus prepontinus fossae intercruralis

Recessus posterior prepontinus trigoni interpeduncularis

Fossa intercruralis