. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 408 Nachdruck verboten. The Segments of the Vertebrate Brain and Head. By Alexander Meek. With 5 Figures. A study of the development of the brain in the Lesser Black- backed Gull, Larus fuscus L., has led to the following conclusions, which I publish, with a few figures, as a preliminary account. Before the closing of the medullary canal and immediately there- after the brain is wide in front and gradually narrows to pass into the spinal cord like region posteriorly. The forward expansion is in- tensified by the early develop
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 408 Nachdruck verboten. The Segments of the Vertebrate Brain and Head. By Alexander Meek. With 5 Figures. A study of the development of the brain in the Lesser Black- backed Gull, Larus fuscus L., has led to the following conclusions, which I publish, with a few figures, as a preliminary account. Before the closing of the medullary canal and immediately there- after the brain is wide in front and gradually narrows to pass into the spinal cord like region posteriorly. The forward expansion is in- tensified by the early development of the optic vesicles. Even at this period the three primary brain vesicles — prosencephalon, mesencephalon, and rhombencephalon — may be distinguished, and certain important subdivisions of these. In the first (Figs. 1 and 2) there are evidences of a subdivision into three parts, a forward region where the neuropore is closing or has closed which I shall call Pro- somere 1 (P,), a middle region from which the optic vesicle ori- ginates and which later gives rise to the infundibulum and the epi- Myomeres 1—7 Aud. organ. tub. post. Chiasma epiphysis. 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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