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internal features of midbrain circle of willis internal carotid artery vertebral artery basilar artery anterior cerebral artery middle cerebral artery posterior cerebral artery external features of midbrain crus cerebri substantia nigra cerebral peduncle inferior colliculus superior colliculi red nucleus external ear external acoustic meatus middle ear tympanic cavity ossicles incus stapes malleus stapedius tensor tympani chorda tympani tympanic plexus