Fig. 38. Subdivisions of the oculomotor (cranial nerve III) nucleus. Lateral view (A) with rostral (B) and caudal (C) transverse views. Axons from superior rectus (SR) subdivision cross to enter contralateral oculomotor nerve. Axons from the caudal central subdivision innervates the levator palpebrae muscles bilaterally. Subdivisions: caudal central (CC); Edinger-Westphal (EW); inferior rectus (IR); inferior oblique (IO); medial rectus (MR); superior rectus (SR). (Modified from May P, Corbett JJ: In Haines DE [ed]: Fundamental Neuroscience. New York: Churchill Livingstone, 1997.)