202 



THE ELASMOBRANCH FISHES 



VEINS OF BODY WALL 



The veins of the bodj^ wall empty into the lateral abdominal system, the chief 

 vessels of which are the lateral abdominal veins {l.a.v., fig. 185) which run 

 along the sides of the body just under the lining of the body cavity. In the re- 

 gion of the cloaca, right and left lateral abdominal veins are continuous across 





A B 



Fig. 186. Finer vessels in kidney, Eeptanchus maculatus. (C. G. Potter, orig.) A. Segment 

 of kidney showing renal vein and advelientes. B. Section of the kidney showing revehentes 

 entering the postcardinal. 



av., advehentes; da., dorsal aorta; p.c, postcardinal vein; rn., renal vein; rv., revehentes; 

 ur., ureter ; vd., vas deferens. 



the midventral line. Each lateral abdominal receives a cloacal vein (cl.v.) 

 from the rectal region and a femoral vein (f.v.) from the pelvic fin. Between 

 the pelvic and the pectoral regions the lateral abdominals receive numerous 

 tributaries from the thinner musculature of the body wall, which are not 

 shown in figure 185. In the pectoral region it receives the brachial vein {hr.v., 

 fig. 187) from the pectoral fin, the subscapular (s.sc.v.), including the lateral 



cutaneous vein {l.c.v., fig. 187), 

 and the coracoid vein (co.v.) 

 from the ventral part of the 

 girdle; the last-named vessel re- 

 ceives the ventral cutaneous vein 

 from the skin. As the subclavian 

 vein, the lateral abdominal turns 

 sharply upward and enters the 

 duct of Cuvier {s.cl.v., fig. 187). 



VEINS OF SKIN 



S.CI.V. 



Fig. 187. The subclavian vein and its relations, 

 Heptanchus maculatus, lateral view. 



br.v., brachial vein; co.v., coracoid vein; d.c, 

 duct of Cuvier; l.a.v., lateral abdominal vein; 

 /.C.V., lateral cutaneous vein; p.c.s., postcardinal 

 sinus ; s.cJ.v., subclavian vein ; s.sc.v., subscapular 

 vein. 



The dorsal cutaneous vein in Hep- 

 tanchus maculatus (p.d.c, fig. 

 189) runs in the connective tis- 

 sue of the skin along the mid- 

 dorsal line. For convenience of 

 description it may be divided 

 into a posterior and an anterior 



