Journal of comparative neurology . 74 Figs. 72 to 79 From transverse sections through the eye and ear of the fourstages. Figs. 72, 73 non-motile (No. 467).Figs. 74. 75 early flexure (No. 473). 340 G. E, COGHILL Brain. Figs. 76, 77 coiled-reaction (No. 449); early swimming, figures 78, 79 ). The sections through the eye were selected at levels which show the mostextensive area of the lens, and those of the ear at levels whichshow the clearest differentiation of the endolymphatic appendage. THE EFFECT OF ACTIVITY ON THE HISTOLOGICALSTRUCTURE OF NERVE CELLS R. A. KOCHER From t
Journal of comparative neurology . 74 Figs. 72 to 79 From transverse sections through the eye and ear of the fourstages. Figs. 72, 73 non-motile (No. 467).Figs. 74. 75 early flexure (No. 473). 340 G. E, COGHILL Brain. Figs. 76, 77 coiled-reaction (No. 449); early swimming, figures 78, 79 ). The sections through the eye were selected at levels which show the mostextensive area of the lens, and those of the ear at levels whichshow the clearest differentiation of the endolymphatic appendage. THE EFFECT OF ACTIVITY ON THE HISTOLOGICALSTRUCTURE OF NERVE CELLS R. A. KOCHER From the Henry Phipps Psychiatric Clinic, Baltimore,^ and the George WiUinms Hooper Fouiidalion for Medical Research, University of California, San Francisco INTRODUCTION The study of the effect of functional activity on the nior])ht)li)»;yof nerve cells has been the subject of numerous investigationsin the past. These researches liave covered a considerable rangeas to kinds of cells studied, degrees of fatigue, and as to methodsof treatment of the material. There is almost complete agree-ment on one point, namely, fatigue results in appreciable changesin cell structure. There is, however, the utmost divergence ofo
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