. The development of the sympathetic nervous system in mammals. d from the nerve-trunks and to wander intothe walls of the oesophagus until the latter is completely surroundedby these migrant cells. In a few sections short fibers are seen tobend from the vagus trunks toward the oesophagus (fig. 13, vag. 2 The role of the vagi in the development of the sympathetic nervous Anzeiger, Bd. 35, no. 15, 16, pp. 381-390. 238 ALBEET KUNTZ b.)- From the tips of these growing fibers, cells pass in welldefined paths into the walls of the oesophagus. It is probablethat most of the cells
. The development of the sympathetic nervous system in mammals. d from the nerve-trunks and to wander intothe walls of the oesophagus until the latter is completely surroundedby these migrant cells. In a few sections short fibers are seen tobend from the vagus trunks toward the oesophagus (fig. 13, vag. 2 The role of the vagi in the development of the sympathetic nervous Anzeiger, Bd. 35, no. 15, 16, pp. 381-390. 238 ALBEET KUNTZ b.)- From the tips of these growing fibers, cells pass in welldefined paths into the walls of the oesophagus. It is probablethat most of the cells which become separated from the vagiwander out along the fibers of these growing branches. The cellswhich have wandered into the walls of the oesophagus are notarranged in well defined rings as yet, bu^ are loosely scattered inthe tissues (fig. 13, ). The fibers of the vagi do not yet extend beyond the region of theheart. In transverse sections through the stomach, the paths ofthe vagus branches are indicated by the presence of numerous nisp. ^SKo e0 ^. Fig. 13. Transverse section through the oesophagus and the vagus trunks inan embryo 7 mm. in length, X 160. cells like those described above. These cells show a tendency tospread until they have completely surrounded the walls of thestomach. Similar cells are found scattered in the walls ofthe intestine as far as the latter can be traced. Thus, it appearsthat, having once become established in the anterior region of thedigestive tube, these cells migrate posteriorly along its course. That these migrant nervous elements found in the walls of thedigestive tube have migrated thither from the vagus trunks can-not be doubted. There is no difficulty in tracing cells from the SYMPATHETIC SYSTEM IN MAMMALS 239 tipsof the growing branches of the vagi into the walls of the oesopha-gus. Furthermore, it is impossible to trace cells from any othersource. There is no evidence as yet of the migration of cellsfrom, the sympathetic trunks
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmammals, bookyear1910
