. The Journal of comparative neurology and psychology. Fig. 31. Fig. 32. Fig. 31. Amblystoma p., nearly the same stage as that shown in Fig. 30,median sagittal section of forebrain and midbrain, x 40. Fig. 32. Amblystoma p., later stage, median sagittal section. Note the ex-treme curvature of the brain in this and following stages, x 40. from the terminal ridge in the middle line obliquely latero-caudadacross the primitive optic groove. This thickening is formed inanticipation of the ingrowth of optic tract fibers and may be calledthe optic ridge. It separates the optic vesicles from the primi
. The Journal of comparative neurology and psychology. Fig. 31. Fig. 32. Fig. 31. Amblystoma p., nearly the same stage as that shown in Fig. 30,median sagittal section of forebrain and midbrain, x 40. Fig. 32. Amblystoma p., later stage, median sagittal section. Note the ex-treme curvature of the brain in this and following stages, x 40. from the terminal ridge in the middle line obliquely latero-caudadacross the primitive optic groove. This thickening is formed inanticipation of the ingrowth of optic tract fibers and may be calledthe optic ridge. It separates the optic vesicles from the primitiveoptic groove and causes them to be connected by the terminal 25, 28, 29, 30 show this in sections and models. By the time the optic ridge is formed the floor of the forebrainvesicle has become depressed to form broad primitive inferior lobesand in the caudal wall of this a mammillary recess marks the begin-ning of the mammillary bodies (Figs. 26 and 27). This is bounded Johnston, Forebrain Vesicle in Vertebrates. 495 caudally by the tub
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