. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 568 The most interesting change however caused by the downward and backward growth of the brain, affects the visceral mesoderna. The anterior arches have been bent downwards, and all have practi- cally disappeared in the Craniates except the last of the series which forms the mandibular arch. Parachordal Auditory Capsule Lateral Sphenoid. - - Epiphysis 3Iandibiihir Trabe cilia Fig. 6. Acanthias. Founded on a graphic reconsti'uction by Sewektzoff. The cartilages are shown in dark shading. The nerves and the branchial clefts an
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 568 The most interesting change however caused by the downward and backward growth of the brain, affects the visceral mesoderna. The anterior arches have been bent downwards, and all have practi- cally disappeared in the Craniates except the last of the series which forms the mandibular arch. Parachordal Auditory Capsule Lateral Sphenoid. - - Epiphysis 3Iandibiihir Trabe cilia Fig. 6. Acanthias. Founded on a graphic reconsti'uction by Sewektzoff. The cartilages are shown in dark shading. The nerves and the branchial clefts and arches are indicated by numbers. Branchiomeres. It is necessary before considering the gill arches further to recall the above results with regard to the ganglia. The attempt was made to show that in relation to the brain segments there were, from the 3rd prosomere to the 3rd rhombomere, 6 ganglia, which presumably were associated, like the other post-stomial ganglia, with visceral clefts and arches. If the mouth were originally confined to the first of the segments then the mesencephalic flexure has brought about the loss of all the arches until we come to that one associated with the mandi- bular V. Reverting to the nomenclature given above when the nerves were considered, the primitive mouth was more than likely innervated by the thalamic, and as soon as the mesencephalic flexure established its Craniate position, the mesencephalic, trochlear, and V^ and V^ clefts and arches were absorbed or modified. The labial cartilages remain in the lower Craniates to remind us of the gills and gill arches involved in the mouth area, and also to suggest that the non-sensorial portion of the nose may owe somewhat to gill cleft 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.
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