Point 19 Intro Pathway Deficit Overview Problems Contents Anatomy

Axons from this nucleus pass DORSALLY around the aqueduct and DECUSSATE immediately caudal to the inferior colliculi. The trochlear nerve (which is quite thin) then winds around the cerebral peduncle and eventually innervates the SUPERIOR OBLIQUE (SO4). This is the only cranial nerve to emerge from the dorsal aspect of the brain stem.