. The development of the sympathetic nervous system in mammals. gain,the preparations studied show figures of cells escaping from thegrowing branches of the vagi into the anlagenof the cardiac plexusand the sympathetic plexuses in the walls of the visceral organswhich are perfectly clear, and can be interpreted only to meanthat these are the cells which give rise to the vagal sympatheticplexuses. The majority of the cells migrating peripherally along the fibersof the vagi are characterized by large rounded or elongated nucleishowing a delicate chromatin structure, and very little cytoplasm. 24
. The development of the sympathetic nervous system in mammals. gain,the preparations studied show figures of cells escaping from thegrowing branches of the vagi into the anlagenof the cardiac plexusand the sympathetic plexuses in the walls of the visceral organswhich are perfectly clear, and can be interpreted only to meanthat these are the cells which give rise to the vagal sympatheticplexuses. The majority of the cells migrating peripherally along the fibersof the vagi are characterized by large rounded or elongated nucleishowing a delicate chromatin structure, and very little cytoplasm. 244 ALBERT KUNTZ These are ob^iously the ^indifferent cells of Schaper. Amongthese, other cells occasionally are found which are characterizedb^^ large rounded or elongated nuclei showing a well defined nucle-olus and very little chromatin structure, and a larger CAiioplasmicbody which is usually drawn out to a point at one side (fig. 17).These cells are obviously the ^^neuroblasts of Schaper. Fromthis description it is ob^dous that the cells which migrate from. Fig 16. Diagram designed to show the relation of the vagi to the vagal sympa-thetic plexuses. The arrows indicate the course and the direction of the ceEs mi-grating from the walls of the hind-brain and the vagus ganglia into the anlagenof the vagal sjinpathetic plexuses. Aortic arch, aw., Auricle. Buccal cavity. 6r., Bronchi, , Anlagenof cardiac plexus. Cerebellum. /.5., Fore-brain, Ganglion of the trunk,, Mid-brain. Medulla oblongata. ?, Neural tube, oe., , (Esophageal plexus, Pulmonary artery, Stomach. /., Ventricle, ven, IV., Fourth ventricle, , Vagus trunk. 10., Roots of vagusnerve. 11., Roots of spinal accessory ner^^e. 12., Roots of hjT>oglossal First cer^dcal nerve. the vagus gangha and the walls of the hiad-braia along the vagiare cells of the same character as those which migrate from theneural tube and the s
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmammals, bookyear1910
