450 



OTTO F. KAMPMEIER 



6c 4 



6c 



rti * v i; -■ . k* ^ **5%c:^ JSP* 



■ 



- 14 



- 





, v r^ 



&& 



■-. g^ », ■ ■ 



13 



Fig. 21 Transverse section through the cisterna chyli region in a 22 mm. pig 

 embryo (series 105, slide 42, section 8), X 200. 4, anlage of the cisterna chyli 

 showing extra-intimal replacement of the supracardinal veno-lymphatics (6c) ; 

 14, sympathetic nerve trunk; 13, wall of the aorta. 



vein or of the rejected and defunct intima lying in the lumen 

 of this embryonic lymphatic. 



The enlargement and perfection of the developing cisterna chyli, 

 as well as of the other segments of the thoracic duct, will be con- 

 sidered in the treatment of the succeeding and final phase. 



8. The lymphatic phase {22-28 et seq. embryos) 



At the period when lymphatic spaces are appearing around the 

 periaortic veno-lymphatics and are growing in volume, the thor- 

 acic duct anlage has already become a continuous structure in the 



