CARPENTEE :- DEVELOPMENT OF THE OCULOMOTOK NEEVE. 229 



n. opt Optic nerve. 



n. trek Trochlear nerve. 



n'ax Neuraxon. 



n'ax med. .... MeduUated neuraxon. 



n. b'l Neuroblast. 



». b'l.' Neuroblast. 



n. b'l." Neuroblast. 



nd. Rnv Node of Ranvier. 



nidi, oc'mot Oculomotor nidulus. 



nl Nucleus. 



par, ms'e. v Ventral wall of mid-brain. 



par. mfe. v Ventral wall of hind-brain. 



par. rtn. ex Outer wall of retina. 



par, rtn, i Inner wall of retina. 



pdl. opt Optic peduncle. 



phx Pharynx. 



pi'n Perineurium. 



prose Fore-brain. 



rm. comn Communicating ramus. 



rm.f. Frontal branch. 



rm. mu. qd. + pyr. . Branch to quadratus and pyramidalis muscles. 



rm. mu. rt. a. . . . Branch to anterior rectus muscle, 



rm. mu. rt. d. . . , Branch to dorsal rectus muscle. 



rm, mu. rt. p, ... Branch to posterior rectus muscle. 



rm. mu. rt. v, , . . Branch to ventral rectus muscle. 



rm, na Nasal branch. 



rm, 71. cil. oc'mot, . . Branch from oculomotor ciliary nerve. 



rm. opth. trig. . . . Ophthalmic branch of trigeminal nerve. 



rm. V Ventral ramus. 



trt.fbr. o Ventral fibre tract. 



vel. marg Marginal veil. 



vn. crd. a Anterior cardinal vein. 



