. The American journal of anatomy . ; 8, root of a precardinal segmentaltributary; 9, internal jugular vein; 13c, carotid artery; 14, sympathetic nervetrunk; 15, vagus; 16, recurrent laryngeal nerve; 17, oesophagus; 18, trachea.(Reconstruction, fig. 28.) ritory lateral and dorsal to the sympathetic trunk. In figure28, which represents a reconstruction of a 19 mm. embryo, thesetwo kinds of tributaries (6a, 8) and their relations to the neigh-boring structures can be clearly distinguished. Continued back from the terminals of the precardinal veno-lymphatics (6a, fig. 28) is a vessel which passes
. The American journal of anatomy . ; 8, root of a precardinal segmentaltributary; 9, internal jugular vein; 13c, carotid artery; 14, sympathetic nervetrunk; 15, vagus; 16, recurrent laryngeal nerve; 17, oesophagus; 18, trachea.(Reconstruction, fig. 28.) ritory lateral and dorsal to the sympathetic trunk. In figure28, which represents a reconstruction of a 19 mm. embryo, thesetwo kinds of tributaries (6a, 8) and their relations to the neigh-boring structures can be clearly distinguished. Continued back from the terminals of the precardinal veno-lymphatics (6a, fig. 28) is a vessel which passes obliquely over theaorta and oesophagus to enter the right postcardinal vein at thelevel of the Cuvierian ducts (7, fig. 28). Although it is morpho-logically a part of the precardinal veno-lymphatics, it will oftenbe treated separately and called the oblique vessel on account ofits diagonal course. The simplicity and size of this vessel varieswith the individual, but it is a constant factor in all of the early 420 OTTO F. KAMPMEIER. Fig. 2 Transverse section taken near the level of the left Cuvierian duct ina 17 mm. embryo (series 167, slide 15, section 22), X 100. 6a and 7 (oblique vessel),precardinal veno-lymphatics located in the positions of the later right and leftthoracic ducts respectively; 8, dorsal segmental vein; 10, left precardinal; lid,right postcardinal; 12ld, 12ls, right and left supracardinal lines; 13, aorta; 14,sympathetic nerve trunk; 15, vagus; 17, oesophagus; 18, trachea. stages of the thoracic duct history. In figure 2,21 it (7) is illus-trated in section, taken just in front of its junction with themiddle segment of the right supracardinal line, which in thisembryo (17 mm.) had not yet fused throughout its entire extentwith the right postcardinal. 21 The image of the sections being reversed by the microscope lens, the structuresof the right side of the embryos are seen on the left side in the microphotographs,and vice versa. However, in the dorsal views o
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1912
