The oculomotor nerve arises from the ventral aspect of the cerebral crus by three bundles. It pierces the dura mater and passes through the foramen orbitorotundum dividing into R. dorsalis and R. ventralis. The former innervates Mm. rectus dorsalis and levator palpebrae superioris while the latter supplies Mm. rectus medialis and obliquus ventralis. The abducent nerve springs from the rostral portion of the ventral lateral suicus of the medulla oblongata by two bundles. It emerges via the for amen orbitorotundum then divides into two branches supply Mm. retractor bulbi and rectus lateralis.