. Journal de neurologie comparative . nerf et ofgroupes de cellules similaires situées dans le mésenchyme approximatelyin une ligne directe de ce point vers l'anlage du ciliaryganglion justifie la conclusion que les cellules qui advancepérimerally du ganglion semilunar le long des fibres du nerf ophtalmique dévient du cours de Ce nerf et, avançant à travers le mésenchyme, entrez dans l'anlage du GANGLIA SYMPATHIQUE CRÂNIEN DANS LE ganglion ciliaire 81 DE PORC. À un stade ultérieur, comme on le montre actuellement, le ganglion ciliaire devient connecté avec l'ophthalmicrabe par une ramie fibreuse

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. Journal of comparative neurology . nerve and ofgroups of similar cells lying in the mesenchyme approximatelyin a direct line from this point toward the anlage of the ciliaryganglion warrants the conclusion that cells which advanceperipherally from the semilunar ganglion along the fibers ofthe ophthalmic nerve deviate from the course of this nerve and, advancing through the mesenchyme, enter the anlage of the CRANIAL SYMPATHETIC GANGLIA IN THE PIG 81 ciliary ganglion. At a later stage, as will be shown presently, the ciliary ganglion becomes connected with the ophthalmicnerve by a fibrous ramies. In embryos of the pig 20 to 21 mm. in length in which theeye-muscles are already well differentiated, the ciliary ganglionlies in close proximity with ^he optic stalk, but still remainsintimately associated with the oculomotor nerve (fig. 7, Cil).Fibers from this nerve now peiletrate the ganglionic mass. Theciliary ganglion, up to this stage of development, is much moreintimately associated with the oculomotor than with the oph-. Fig. 6 Parasagittal section cutting ophthalmic nerve longitudinally, embryoof pig 14 mm. in length. Cil, ciliary ganglion; Ma, maxillary nerve; MC, migrantcells; Oc, oculomotor nerve; Oph, ophthalmic nerve; S, semilunar ganglion. Fig. 7 Parasagittal section cutting ophthalmic nerve longitudinally, embryoof pig 21 mm. in length. Abd, abducent nerve; Cil, ciliary ganglion; Oc, ocu-lomotor nerve; Oph, ophthalmic nerve; OS, optic stalk; (S, semilunar ganglion. thalmic nerve. While there can be no doubt that some cellswhich advance peripherally from the semilunar ganglion alongthe ophthalmic nerve enter the ciliary ganglion, it is probablethat the great majority of the cells which become incorporatedin this ganglion are cells which advance peripherally along theoculomotor nerve. At a later stage, as illustrated in figure 8, which is taken from a parasagittal section of an embryo of thecat 22 mm. in length, the ciliary ganglion is connected with theophthal

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