. The development of the sympathetic nervous system in mammals. of the spinal nerves and the communicating rami. The difference between these two views may be accounted forin part by fundamental differences in the morphogenesis of thesympathetic nervous system in the various classes of vertebrates. 220 ALBERT KUNTZ close proximity with each other that the entire anlage of thesjnnpathetic trunk appears as a continuous cell-column. Thiscell-column is not of uniform diameter, but in transverse sectionstraces of it are not wanting in any section in the thoracic and thedorsal region. Fibers are not
. The development of the sympathetic nervous system in mammals. of the spinal nerves and the communicating rami. The difference between these two views may be accounted forin part by fundamental differences in the morphogenesis of thesympathetic nervous system in the various classes of vertebrates. 220 ALBERT KUNTZ close proximity with each other that the entire anlage of thesjnnpathetic trunk appears as a continuous cell-column. Thiscell-column is not of uniform diameter, but in transverse sectionstraces of it are not wanting in any section in the thoracic and thedorsal region. Fibers are not present as yet either in the anlagenof the sympathetic trunks or in the communicating rami. Thesympathetic anlagen are essentially cellular. The cells areclosely aggregated and many of them present delicate protoplas-mic processes, or are included in small syncji;ia. These struc-tures are not very apparent in transverse sections, but in sagittalor frontal sections the anlagen of the sympathetic trunks presentthe appearance of a loose-meshed cellular mes. p/.a. -supr Fig, a. Diagrammatic transverse section of an embryo 12 mm. in lengththrough the suprarenal bodies, X 50. SYMPATHETIC SYSTEM IN MAMMALS 221 § I 4 , fdevelopmentofsym00kunt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmammals, bookyear1910
