DISSECTING MANUAL. 



and run upward behind and then in the Rectus. At the 

 internal ring the vas deferens (or round ligament) and geni- 

 tal nerve hook rounds its front and outer side. Its branches 

 are muscular; cutaneous, to the anterior abdominal wall; 

 cremasteric, descending in the inguinal canal to the cord 

 (or round ligament) ; and pubic, descending beside the crural 

 ring to the pubis. [856] 



The deep circumflex iliac runs just above the lower border of 

 Poupart's ligament to the anterior superior iliac spine, then 

 through the Trans versalis, and then backward between this 

 muscle and the Internal oblique. Its branches are muscular 

 and cutaneous. [857] 



VEINS. 



Inferior Vena Cava. Commencing on the right side of the 

 body of the fifth lumbar vertebra, by the union of the common 

 iliacs, this ascends on the right side of the spine, to the right of 

 the aorta, and pierces the diaphragm opposite the eighth dor- 

 sal vertebra. Tributaries. The hepatic veins open into its 

 upper end, just under the diaphragm, in two groups: the upper 

 group consists of a' right, a left, and (usually) a Spigelian 

 trunk, from those lobes; the lower group consists of from six 

 to twenty small veins from the right and Spigelian lobes. The 

 renal veins are single and lie in front of their arteries : the left 

 one crosses over the aorta. The inferior phrenic are the venae 

 comites; the left ones usually end in the left suprarenal vein. 

 The suprarenal veins are single; the left one usually joins the 

 left renal vein. There are usually four lumbar veins on each 

 side, one with each artery; they may all end in a common 

 trunk which joins the inferior vena cava; on each side they 

 are all united by the ascending lumbar vein. The spermatic 

 veins form a plexus (pampiniform) about the cord, from which 

 two veins ascend through the internal ring and unite later in 

 a single trunk, which joins the (right side) vena cava or (left 

 side) left renal vein. The ovarian veins form a plexus (pam- 



[212] 



