| OCR Text |
Show 350 Ml!. E. E. BRDDARD OX THE [Feb. 16, vessels gives off branches to the fat-body. The posterior suprarenal body, I m a y remark, receives only one portal branch, in which it differs from the anterior suprarenal. The oviducal artery of the posterior oviduct arises after the inferior mesenteric (which immediately follows the ovarian artery) and the first renal artery. Its origin is distinctly from the left side of the aorta, as is that of the ovarian artery; this position is marked by the median ventral origin of the inferior mesenteric. The first branch given off joins the longitudinally running ovarian artery ; about halfway between its origin from the aorta and the oviducal walls a stout branch arises which goes, I believe, to the fat-body *. The artery then passes straight to the longitudinal artery of the oviduct, without giving off anything more than very minute branches. The second oviducal artery arises at the same distance behind the third t intestinal artery as the first oviducal artery is behind the inferior mesenteric. The peculiarity about this artery is that as it turns round the anterior end of the posterior kidney it gives off a branch to that organ. Thereafter follows a series of arteries which are the renal arteries, though they largely give off branches to the oviduct; they are dealt with below. Behind the kidney a series of small vessels arises from the aorta to supply the walls of the oviduct; similar vessels arise on the opposite side of the aorta and supply the other oviduct. i Spermatic Arteries.-Of these there are only two, one for each testis. The anterior testis is considerably the larger gonad. The artery of the anterior testis is the first visceral artery after the superior mesenteric. Before reaching the suprarenal capsule it gives off a strong branch which runs dorsally of the testis to the fat-body. It forms a longitudinal artery running along the suprarenal and the testis, which is posteriorly continued along the vas deferens. Anteriorly the spermatic artery branches into a few slender tubes which are lost on adjacent mesenteries and possibly also supply the fat-body. The suprarenal receives two portals, one at each end-exactly as does the corresponding suprarenal of the female snake. Similarly the posterior suprarenal has only a single portal vein. The second spermatic artery does not give off any well-marked branch to the fat-bocly; but there may be slender twigs. Renal Arteries.-The renal arteries of the anterior (right-hand) kidney are largely mixed up with arteries supplying the oviduct, indeed all the renal arteries provide branches for that region of the oviduct which lies opposite to the kidney. There are four of them altogether, of which the first is rather farther apart from the others than they are from each other. The first of these arteries springs from the aorta between the inferior mesenteric and the oviducal artery of the posterior oviduct. Arrived at the edge very near to * The fact that the artery had accidentally been broken does not allow me to speak positively. f Reckoning the superior mesenteric as the first. |
