The development of the human body; a manual of human embryology . rotid gland, a circumstance which has probablyassisted in producing confusion as to the real significance of theintercarotid ganglion. The Organs of Zuckerkandl.—In embryos of have been found, in front of the abdominal aorta,closely packed groups of cells which resemble in appear-ance the cells, composing the ganglionated cord, two ofthese groups, which extend downward along the side of theaorta to below the point of origin of the inferior mesen-teric artery, being especially distinct. These cell groupsgive rise to
The development of the human body; a manual of human embryology . rotid gland, a circumstance which has probablyassisted in producing confusion as to the real significance of theintercarotid ganglion. The Organs of Zuckerkandl.—In embryos of have been found, in front of the abdominal aorta,closely packed groups of cells which resemble in appear-ance the cells, composing the ganglionated cord, two ofthese groups, which extend downward along the side of theaorta to below the point of origin of the inferior mesen-teric artery, being especially distinct. These cell groupsgive rise to the ganglia of the praevertebral sympatheticplexuses and also to peculiar bodies which, from theirdiscoverer, may be termed the organs of body stands in intimate relation with the fibers ofthe sympathetic plexuses and has a rich blood-supply, ACCESSORY SYMPATHETIC ORGANS. 451 resembling in these respects the intercarotid ganglia, andthe resemblance is further increased by the fact that thespecific cells of the organ are markedly Fig. 237.—Accessory Sympathetic Organs op Zuckerkandl from a New-born , Aorta; ci, inferior vena cava; , common iliac artery; mi, inferior mesenteric artery; and , left and right accessory organs; , aortic plexus; u, ureter; , left renal vein.—{Zuckerkandl.) At birth the bodies situated in the upper portion of theabdominal cavity have broken up into small masses, butthe two lower ones, mentioned above, are still well defined(Fig. 237). Even these, however, seem to disappear later 452 THE DEVELOPMENT OF THE HUMAN BODY. on and no traces of them have as yet been found in theadult. The Coccygeal or Luschkas Ganglion.—In embryos ofabout 15 cm. there is to be found on the ventral surface ofthe apex of the coccyx a small oval group of polygonalcells, clearly separated from the surrounding tissue by amesenchymal capsule. Later, connective-tissue trabe-culae make their way into the mass, which thu
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
