. Journal of comparative neurology. eral and anterior to the pointwhere the taenia thalami meets the di-telencephalic groove andvelum transversum the hemisphere wall is massive and unin-vaginated. It would seem, then, that in this embryo, thelateral telencephahc plexus lies entirely in the roof plate of thetelencephalon. The condition is diagrammatically representedin figure 11. Figures 23 and 24 depict the region around the foramen ofMonro in an embryo with a carapace mm. long, about 14 length. Figure 23 looks at the foramen of the righthalf of the brain from the medial side.
. Journal of comparative neurology. eral and anterior to the pointwhere the taenia thalami meets the di-telencephalic groove andvelum transversum the hemisphere wall is massive and unin-vaginated. It would seem, then, that in this embryo, thelateral telencephahc plexus lies entirely in the roof plate of thetelencephalon. The condition is diagrammatically representedin figure 11. Figures 23 and 24 depict the region around the foramen ofMonro in an embryo with a carapace mm. long, about 14 length. Figure 23 looks at the foramen of the righthalf of the brain from the medial side. The cephalic end of the MORPHOGENESIS OF THE CHOROID PLEXUSES 523 model is, consequently to the left. The paraphysis whichhad been removed is represented by a line of white 24 looks at the same foramen from the lateral side. Themodel is therefore reversed and the cephalic end points to theright. The condition of the roof-plate is diagrammatically representedin figure 12. The differentiation between hemisphere wall and. Fip;. IG Transverse section from the forebrain of an embryo of Chrysemysmarginata having a carapace mm. in length. Embryo 5 b, slide 13, sect. 33J. Fig. 17 Transverse section of the same embryo; section IG, slide 13. X 33J. roof plate is clear and the taenia fornicis obvious (figs. 10 and17). The anterior extremit} of the lateral telencephalic plexusarises plainly from the telencephalic roof plate lateral to theparaphysis and medial to the taenia fornicis (fig. IG). Figure 17 shows a section posterior to figure 16 through the main bodyof the plexus, the plexus still bing in the roof plate. Figure 18 is of a section still farther posteriorly. The plexus is hereshown crossing the taenia fornicis into the medial hemispherewall. The taenia fornicis is now medial to the plexus and drop- 524 PERCIVAL BAILEY ping down to meet the anterior nucleus of the thalamus, whichit does in a few sections and becomes continuous with the taeniathalami. In figu
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Keywords: ., bookauthorw, bookcentury1900, bookdecade1910, booksubjectmedicine
