4. =A. ileocolica.=--This passes to the cæcum and supplies that structure, sending branches to the ileocolic valve and the caudal end of the ileum, and anastomosing with the colica dextra and the intestinal branches of the superior mesenteric. 5. The superior mesenteric now divides into about sixteen terminal branches which pass to the small intestine. In many cases these branches unite near the intestine, forming arches, and from these arches numerous short branches pass to the intestine. 3. =A. adrenolumbalis= (or =lumboabdominalis=) (Fig. 126, _e_).--This rises from the aorta, one on each side, about two centimeters caudad of the superior mesenteric. Each passes laterad onto the dorsal body wall, supplying the muscles of this region. A large branch passes caudad along the surface of the muscles dorsad of the kidney and anastomoses with the iliolumbar artery. From the adrenolumbalis rises usually: =A. phrenica= (_f_).--The phrenic artery rises either from the cœliac (_c_) or the adrenolumbalis (_e_) and passes to the diaphragm, near its dorsal border. In the diaphragm it passes ventrad, lying at the medial margin of the costal portion of the diaphragm, as far as its sternal portion, where it unites with the artery of the opposite side. The two thus form an arch, from which radiating arteries pass off to supply the diaphragm. 4. =A. renalis= (_g_).--The two renal arteries arise from the sides of the aorta, usually at about the same point, so that the left passes caudolaterad and the right craniolaterad (owing to the position of the kidneys). The artery usually divides just before entering the kidney (2). It passes dorsad of the vein (_t_). The renal artery sometimes sends a branch to the suprarenal body (1). It also occasionally gives origin to the spermatic artery (_h_). [Illustration: FIG. 126.--ABDOMINAL BLOOD-VESSELS, VENTRAL VIEW. _a_, vena cava inferior; _b_, abdominal aorta; _c_, A. cœliaca (cut); _d_, A. mesenterica superior (cut); _e_, A. adrenolumbalis; _f_, A. phrenica; _g_, A. renalis; _h_, A. spermatica interna; _i_, A. mesenterica inferior (cut); _j_, A. iliolumbalis; _k_, A. iliaca externa; _l_, A. hypogastrica; _m_, beginning of A. femoralis; _n_, A. umbilicalis; _o_, A. and V. sacralis media (_o_, the artery; _o′_, the vein); _p_, A. glutea superior; _q_, A. glutea inferior; _r_, A. and V. hemorrhoidalis media; _s_, V. adrenolumbalis; _t_, V. renalis; _u_, V. spermatica interna; _v_, V. iliolumbalis; _w_, V. iliaca communis; _x_, V. femoralis; _y_, V. and A. profunda femoris; _z_, V. hypogastrica. 1, suprarenal body; 2, kidney; 3, ureter; 4, outline (broken) of rectum.]