. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 501 of the sub-commissural organ. Text-fig. 5 represents another section from the same series, but near the anterior end of the sub-commissural organ. The epithelium is seen to be losing its characteristic columnar appearance, especially in the middle line, but Reissner's fibre is still present, and, indeed, in this and neighbouring sections may be seen breaking up into branches, which actually run to the epithelium. The Chimpanzee. — Here, again, we have studied the sub-com- missural organ by means of serial transverse secti
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 501 of the sub-commissural organ. Text-fig. 5 represents another section from the same series, but near the anterior end of the sub-commissural organ. The epithelium is seen to be losing its characteristic columnar appearance, especially in the middle line, but Reissner's fibre is still present, and, indeed, in this and neighbouring sections may be seen breaking up into branches, which actually run to the epithelium. The Chimpanzee. — Here, again, we have studied the sub-com- missural organ by means of serial transverse sections. The entire brain had been hardened in situ by means of formalin and alcohol for ordinary anatomical purposes. It is naturally not in a good condition fie frc ~. rf. ?' »CO ( Fig. 4. Fig. 5. Fig. 4. Cat. Transverse section through the sub-commissural organ in the region of the posterior commissure. ^ 192. posterior commissure; Reissner's fibre; sub-commissural organ. Fig. 5. Cat. Transverse section through the region of the posterior commissure considerably antei-ior to the section shown in text-fig. 4. X 75. posterior commissure; Reissner's fibre; sub-commissural organ. for the study of minute histological details, but shows very clearly the general form and relations of the parts under discussion. The sub-commissural organ commences, as in the mouse, on the anterodorsal aspect of the posterior commissure, where the latter forms the floor of the infra-pineal recess (compare text-fig. 1), where however, it is very feebly developed. It can be followed backwards beneath the posterior commissure as a broad and very shallow groove (v. Plate, fig. 1 )^ the epithelium of which shows the nuclei arranged in several layers, but does not exhibit the typical differentiation until we come to about the hinder limit of the posterior commissure (text- fig. 6). Here the sub-commissural organ takes the form of two. Please note that these images are
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