. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 192 petra. To make this clear I reproduce here (Fig. 9) a figure from my former paper and along with it a drawing of a similar section of the medulla oblongata of the ammocoetes of P. dorsatus. As for the ar- rangement of "amacrine cells", I do not recognize that such cells exist in the brain of Lampetra at least. Examples of all the different types of neurones are found with true axones clearly recognizable. Where axones have not been seen I have attributed it to faulty impregnation. It is true that many axones are
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 192 petra. To make this clear I reproduce here (Fig. 9) a figure from my former paper and along with it a drawing of a similar section of the medulla oblongata of the ammocoetes of P. dorsatus. As for the ar- rangement of "amacrine cells", I do not recognize that such cells exist in the brain of Lampetra at least. Examples of all the different types of neurones are found with true axones clearly recognizable. Where axones have not been seen I have attributed it to faulty impregnation. It is true that many axones are difficult to recognize. I have clearly. Fig. 9. A, part of a transverse section of tiie myelencephalon of adult Lampetra at about the level of the N. glossopharyngeus. Reproduced from Johnston 1902 (Fig. 9 a). B, left half of a transverse section of the brain of the ammocoetes of Petro- myzon dorsatus at the same level. Both drawings are taken from sections stained by nuclear stains and the nuclei of the cells are drawn under the camera. It is seen that essentially the same arrangement of functional centers is present in both brains. ac. acusticum. Lv. lobus vagi or visceral sensory column, central gray. IV fourth ventricle, lateral (visceral) motor cotumn. ventral (somatic) motor column. internal arcuate fibers, sp. V tractus spinalis trigemini. ). V nucleus of the Same (substantia gfelatinosa). pointed out that the dendrites are often nearly as slender and smooth as the axones (e. g. in the hypothalamus) and that in many cases the axone takes its origin from some part of the dendrites far removed from the body of the cell. So far as the brain is concerned at least,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Anatomische Gesellschaft. Jena : G. Fischer
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