. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 540 lateral branches were of unequal size, probably varying with the amount of blood contained in them. Numerous other small branches penetrated throughout the new The nervous system oflers the most important evidence that a new head had been regenerated. The development of a cerebral gan- glion and two oesophageal commissures connecting it with the nerve cord is complete and corresponds exactly with what is found in the normal head. A section through one of the commissures is represented in fig. 4 Cm. The fifth sect
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 540 lateral branches were of unequal size, probably varying with the amount of blood contained in them. Numerous other small branches penetrated throughout the new The nervous system oflers the most important evidence that a new head had been regenerated. The development of a cerebral gan- glion and two oesophageal commissures connecting it with the nerve cord is complete and corresponds exactly with what is found in the normal head. A section through one of the commissures is represented in fig. 4 Cm. The fifth section in the series beyond fig. 4 is given in fig. 5. Here the cerebral ganglion (BB.) is completely separated from the ventral nerve cord (NC.) while in the intermediate sections the commissure is connected with both the ganglion and the nerve cord. Unfortunately the sections pass somewhat diagonally through this region, yet the relation of the parts is perfectly evident even in this plane. Since, in AUolobophora foetida there are no openings in the ventral nerve cord and the only point at which the nervous system is penetrated by other organs is where the commissures pass around the pharynx, the presence of an opening in the regenerated segments gives strong evidence of the development of a brain. A charac- teristic feature of the regenerated brain, which should be noted in this connection, is, as in the normal worm, the presence of large ganglion cells surrounding both the cerebral ganglion and the pharyn- geal commissures, in contrast to the ventral nerve cord which has ganglion cells on the ventral side 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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