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Interpeduncular fossa
The interpeduncular fossa is a deep depression of the ventral surface of the midbrain between the two cerebal crura.[1][2][3] It has been found in humans and macaques, but not in rats or mice, showing that this is a relatively new evolutionary region.[4] StructureThe interpeduncular fossa is a somewhat rhomboid-shaped area of the base of the brain.[5] FeaturesThe lateral wall of the interpeduncular fossa bears a groove - the oculomotor sulcus - from which[6] rootlets of the oculomotor nerve emerge from the substance of the brainstem and aggregate into a single fascicle.[3][6] Anatomical relationsThe ventral tegmental area lies at the depth of the interpeduncular fossa.[3] BoundariesThe interpeduncular fossa is in front by the optic chiasma, behind by the antero-superior surface of the pons, antero-laterally by the converging optic tracts, and postero-laterally by the diverging cerebral peduncles.[5] The floor of interpeduncular fossa, from behind forward,[citation needed] are the posterior perforated substance,[2] corpora mamillaria, tuber cinereum, infundibulum, and pituitary gland.[citation needed] ContentsContents of interpeduncular fossa include oculomotor nerve, and circle of Willis.[citation needed] The basal veins pass alongside the interpeduncular fossa before joining the great cerebral vein.[7] Clinical significanceThe most common locations for neurocutaneous melanosis have occurred along the interpeduncular fossa, ventral brainstem, upper cervical cord, and ventral lumbosacral cord.[8] See alsoAdditional images
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