Journal of comparative neurology . Fig. 12is 30 M farther ventrad and shows the root connections of these nerves with thebrain [). Around the base of these roots is amass of cells ) which doesnot seem to be a part of the ganglia at this stage. I have called this the rootmass. The preauditory lateral line ganglion and the visceral sensory ganglionof the facial nerve () are represented as a single mass. Its rostral end isin contact with the entoderm of the spiracular pouch. Fig. 13, 14 and 15 Early flexure stage (No 473, sections 1-3-14, 1-4-6 and 1-4-12respectively.) X 50. These se
Journal of comparative neurology . Fig. 12is 30 M farther ventrad and shows the root connections of these nerves with thebrain [). Around the base of these roots is amass of cells ) which doesnot seem to be a part of the ganglia at this stage. I have called this the rootmass. The preauditory lateral line ganglion and the visceral sensory ganglionof the facial nerve () are represented as a single mass. Its rostral end isin contact with the entoderm of the spiracular pouch. Fig. 13, 14 and 15 Early flexure stage (No 473, sections 1-3-14, 1-4-6 and 1-4-12respectively.) X 50. These sections are selected from the series from whichfigure 2 was made, and should be compared with it. Fig. 13 illustrates the ophthalmic ganglion after it has detached itself from theectoderm, leaving an ectodermal thickening at Fig. 14 shows the attenuation of the root of the ophthalmic ganglion ()160 fi caudad of the last figure and at the level of the caudal portion of the eye. THE NERVOUS SYSTEM OF AMPHIBIA 313 314 G. E. COGHILL Fig. 15 is 60 fi still farther caudad, showing the Gasserian ganglion {) con-nected by a slender root with the root mass () at the surface of ther brain,and the relation of this ganglion to the lateral line primordium {). Fig. 16 Early flexure stage (No. 550, section 1-2-14). X 50. This figure isintroduced to show the plane of section of figure 22, which is taken from the samesection. Fig. 17 Coiled-reaction stage (No. 561, section 1-3-14). X 50. This figureis introduced to show the plane of section of figure 33, which was taken from theregion indicated between the lines at c. Fig. 18 Early flexure stage INo. 545, section 5-2-14). X 500. A ganglioncell with its peripheral, dendritic process, in the distal portion of the ophthalmicganglion. The spherules in the cytoplasm are yolk. Fig. 19 Early flexure stage (No. 593, section 2-5-7). X 500. Ganglion cellsof the Gasserian ganglion, with axones reaching towards the brain
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Keywords: ., bookauthorw, bookcentury1900, bookdecade1910, booksubjectmedicine
