234 ZOOTOMY. 



22 1. The dorsal aorta (d.ao), a small artery lying in the 

 middle line between the kidneys. 



XXXIV. Carefully dissect away one of the kidneys, bit 

 by bit, , taking care not to injure the veins in 

 connection with it : make out : 



222. The renal portal vein {r.f), pas; ing ihrough tlie substance of the 

 kidney to join the femoral just external to the point where the latter 

 unites with the renal vein : during its course through the kidney, the 

 renal portal gives off several small afferent renal veins {a.r.v) to the 

 middle and posterior lobes, the anterior lobe being supplied by similar 

 vessels springing from the anterior face of the femoral vein : the renal 

 portal is joined near the hinder boundary of the kidney by one or two 

 small veins frorri the sacral region {a.r.v'). 



223. The femoral artery {f.a), given off from the 

 aorta between the anterior ends of the kidneys, and passing 

 almost directly , outwards to supply the anterior region of 

 the thigh : it leaves the body cavity ventral to the pelvis, 

 and is accompanied by the femoral nerve (§ 293). 



As the femoral artery leaves the body cavity, it sends 

 off a small vessel which passes along the ventral border of 

 the pubis, accompanying the vein already seen (§ 219), and 

 a branch of the obturator nerve (§ 293). 



224. The sciatic artery [sea), given off from the 

 aorta at about the junction of the anterior and middle 

 lobes of the kidney ; it passes outwards and backwards 

 through the substance of the kidney, emerges from that 

 organ at the junction between its middle and posterior 

 lobes, leaves the body cavity through the ilio-sciatic foramen 

 (§ 104) to reach the thigh, and then passes slightly forwards 

 as well as outwards so as to assume a course parallel to the 

 femoral vein. It is accompanied by the great sciatic 

 nerve (§ 294). 



225. The sciatic vein {sc.v), bringing blood from the 

 posterior part of the leg ; it runs parallel to the proximal 



