. The American journal of anatomy . Fig. 26 Transverse section through the region of the cisterna chyli in a 23 embryo (series 67, slide 43, section 14), X 150. 5, anlage of the cisterna chylishowing the indefinite and ragged outline of its cavity, the absence of a specializedintima, and the addition of small spaces (4) from the mesenchyme; the vestigesof the former veno-lymphatics have completely disappeared; 13, aorta; 14, sym-pathetic nerve trunk. THORACIC DUCT DEVELOPMENT IN THE PIG 457 12d 12 s V> V-- ViM&i ■ • - kw r 14 i 5d - ■UV»■$^-t-^Tji ) , < -•. - Fig. 27 Transverse se
. The American journal of anatomy . Fig. 26 Transverse section through the region of the cisterna chyli in a 23 embryo (series 67, slide 43, section 14), X 150. 5, anlage of the cisterna chylishowing the indefinite and ragged outline of its cavity, the absence of a specializedintima, and the addition of small spaces (4) from the mesenchyme; the vestigesof the former veno-lymphatics have completely disappeared; 13, aorta; 14, sym-pathetic nerve trunk. THORACIC DUCT DEVELOPMENT IN THE PIG 457 12d 12 s V> V-- ViM&i ■ • - kw r 14 i 5d - ■UV»■$^-t-^Tji ) , < -•. - Fig. 27 Transverse section through the anterior supracardinal region in a26 mm. pig embryo (series 69, slide 53, section 10), X 150. 5d,5s, right and leftthoracic ducts; 12d, 12s, right and left supracardinal veins; 13, aorta; 14, sympa-thetic nerve trunk. only after the thoracic duct has lost its multilocular and plexi-form character, and its channel approaches more nearly to aclear-cut and simple tube (5s, fig. 27). The manner in which themesenchymal cell is transformed into an endothelial cell occursundoubtedly, as Huntington has suggested, by a mechanicaladaptation to the pressure of the fluid within the lymphaticcavity. This view is entirely in harmony with the conditionsobserved in the extra-embryonic area of the chick23 where the 23 At the last session of the American Association of Anatomists, December 27,1911, at Princeton, N. J., John E. McWhorter and Allen O. Whipple of the Collegeof Physicians and Surgeons, Columbia University, presented a report on the devel-opment of t
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1912
