LATER DEVELOPMENT OF VASCULAR SYSTEM 373 



P^.sj^s. l^scs. 



^ y.T'.m.s, 



Fig. 214. — Reconstruction of the venous system of a sparrow embryo, 

 corresponding to a chick of about 14 days. (After Miller.) 

 V. c.i. H., Intra-hepatic part of the vena cava inferior. V. c. i. SC, 

 Part of the vena cava inferior derived from the subcardinal vein. V. v. g., 

 Genital veins. V. i. e. d., s., Right, and left vena iliaca externa. V. i. i., 

 Vena iliaca interna. V. i. 1. d., s., Right and left vena intervertebralis lum- 

 balis. V. r. m. d., s., Right and left great renal veins. 



almost exclusively, the pulmonary veins being very rudimentary 

 at this stage. The veins entering the sinus venosus are the ducts 

 of Cuvier, and the meatus venosus. The former are made up 

 on each side by (1) the anterior cardinal vein, returning blood 

 from the head, (2) the posterior cardinal vein returning blood 

 from the veins of the Wolffian bodv, and the intersomitic veins, 

 (3) the umbilical veins returning blood mainly from the body- 



