. Journal of comparative neurology . ximal part of the nerve-rootand many of them obviously migrate peripherally along itsgrowing fibers. In many sections through this region continuousrows of medullary cells may be traced from the mantle layerin the rhombencephalon into the proximal part of this motornerve-root (fig. 3, MC). Similar cells may be observed all alongthe fibers of this motor root as well as along the mandibularnerve peripheral to the point of union of the sensory and themotor roots. Bej^ond this point the cells of medullary and ofganglionic origin can not be distinguished from ea
. Journal of comparative neurology . ximal part of the nerve-rootand many of them obviously migrate peripherally along itsgrowing fibers. In many sections through this region continuousrows of medullary cells may be traced from the mantle layerin the rhombencephalon into the proximal part of this motornerve-root (fig. 3, MC). Similar cells may be observed all alongthe fibers of this motor root as well as along the mandibularnerve peripheral to the point of union of the sensory and themotor roots. Bej^ond this point the cells of medullary and ofganglionic origin can not be distinguished from each other. It isprobable, however, that cells from both these sources advanceperipherally along the fibers of the mandibular nerve. CRANIAL SYMPATHETIC GANGLIA IN THE PIG 77 Oculomotor nerve The oculomotor nerve emerges from the wall of the mesen-cephalon by several slender rootlets arranged in a longitudinalseries (fig. 4, Oc). The proximal part of this nerve, in sagittalsections, therefore, appears distinctly fan-shaped. Throughout. Fig. 3 Section showirg the motor root of the trigeminal nerve in an embryoof the pig 11 mm. in length. EL, external limiting membrane; MC, migrantmedullary cells; MR, motor root. Fig. 4 Section showing the oculomotor nerve in an embryo of the pig 8 length. Cil, ciliary ganglion; FB, fore-brain; Inf, infundibulum; HB, hind-brain; M, mid-brain; Oc, oculomotor nerve. Fig. 5 Neuroblasts (drawn under oil immersion lens with aid of cameralucida). A, observed in mesenchyme between ophthalmic nerve and ciliaryganglion, embryo 14 mm. in length, B, C, D, observed in ophthalmic nerve,embryo 14 mm. in length. the entire length of the growing nerve, its fibers are accompaniedby cells obviously of medullary origin. These cells are identicalin appearance with the cells which, as indicated above, advanceperipherally from the semilunar ganglion and from the wall of 78 ALBERT KUNTZ the rhombencephalon along the several divisions of the trigeminalnerve. They ar
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmedicine, bookyear191
