. The comparative anatomy of the domesticated animals. Veterinary anatomy. 620 TEE VEINS. opinion; and there is every reason to believe ttat the system of the vena port© and that of the vena cava do not communicate, in the adult, otherwise than by the capillary network which is Fig- 29i. intermediate to the subhepatic and suprahepatic vessels. If any other means of communication exist, they must be extremely small. Constituent vessels of the verm portcB. âThe three roots of this vein are the great and small mesenteries and the splenic vein. The collateral affluents it re- ceives on its course
. The comparative anatomy of the domesticated animals. Veterinary anatomy. 620 TEE VEINS. opinion; and there is every reason to believe ttat the system of the vena port© and that of the vena cava do not communicate, in the adult, otherwise than by the capillary network which is Fig- 29i. intermediate to the subhepatic and suprahepatic vessels. If any other means of communication exist, they must be extremely small. Constituent vessels of the verm portcB. âThe three roots of this vein are the great and small mesenteries and the splenic vein. The collateral affluents it re- ceives on its course are principally two : the right gastro-epiploie veins and anterior gastric. We will make a rapid survey of all these vessels. 1. Boots of the Vena Portoe. A. Great Mesenteric oe An- terior Mesaeaio Vein (Fig. 293, 44; 294, 2, 7).âThis is an enormous venous canal into which flows the blood that has passed through the walls of the small intestine, cseoum, large colon, and the origin of the small colon, and whose divisions correspond exactly to the different branches fur- nished by the great mesenteric artery. When traced from its opening to its origin, in an inverse direction to the course of the blood, it is observed to lie between the two colic arteries, and proceed beyond the fold formed THE VENA poBT^ AND ITS ROOTS; PARTLY by the Suprasternal and diaphragmatic THEOEETioAL. curvatuTes, beyond which it divides 1, Trunk of the vena portse; 2, Its origin; j^^^ ^^^ satellite branches for the 3, Veins of the small intestine; 4, Ilio- â ,. , . v- t, i. ââ ;â ' â¢""°.'" Tr^tâ,.ââi âââ,! âJâ. fi Tn colic arteries, which anastomose in c^cal vein; 5, External cajcal vein; b, in- -i i i ⢠ternal caecal vein ; 7, Great mesaraic veia; arcade towards the pelviC Curvature, 8, 9, Colic veins forming the roots of that like the arteries they accompany. vessel; 10, Collateral vein sometimes con- j(. jg therefore by the union of twO tinuing the left colic,
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