■ /.'. Sabin. 



\, - and suppll capsule aa well 



inds. Prom the sac v< row to the Btomi 



tttire intestine, including il • q. The lymphatics of 



troperitoneal sac. The de- 

 the lymphatics of the diaphragm, liver, the 



•i.i! and pan< • ; yel been worked out. 



II. ■ d the lymphatics of the intestine from 



ritoneal ultimate lacteals. While the embryo 



to 4 tin. long a very abundanl plexus "I' capilla 

 - out in nil rv. The lymphl ach the wall of the 



in:- . the time the embryo i> 1 cm. long. They first enter the 



mill form then a primary plexus. Eeuer's 9 and 



in -li.iw that tlie early vessels in the submucosa have a segmental 

 air t. which i-. however, nearly hist as the complete plexus 



The plexus of the mucosa, and of the S( rosa are 1 both second- 

 ary, 'i - develop from lucosal plexus and are present 

 in a pig measui ti. T ie mesenteric vessels and mucosal 

 plexus i ralves. 



iliac lymph I the th fa ii d ct: The lymphatics which 



arise from the veins on nm a very 



simple pattern. Starting from the veins at the hilns of the I 

 Wolffian bo v grow caudalward along the edge of the WolJ 



to make the ilia sacs, bralward along the dorsal sur- 



aorta to form the cisterna chyli. The lymphatics doi 

 to the aorta grow in two directions: (1) caudalward to form a chain 

 of prevertebral lymph nodes and (2) cerebralward b 

 duct. 



The iliac lymphatic ire two long symmetrical sacs extern 



from the bilus of the Wolffian bodies to the level of the bifurcation 

 of tl a. In an embryo 23 mm. long they drain into the mesone- 



phritic time theembryo is •.'■"> to 21 nun. long this 



ection is lost and the two iliac sacs converge into the median 

 cisterna chyli dorsal to the aorta. 



The caudal end of the iliac lyn - in the pig is a sac of con- 



erable size, from which thn of lymphatics can be injected: 



ilio-lumbar, the femoral and a plexus which surround the umbil- 

 ical i ilio-lumbar superficial lymphatics are very con- 

 mown in figs. I and 5 (Sabin L30). This is in 

 mai otrasl to the human embryo, where they form part of the 

 inguinal group. 



