. Anatomy, descriptive and applied. Anatomy. 1312 THE ORGANS OF DIGESTION left colic branch of the inferior mesenteric, and the sigmoid flexure by the sigmoid branches of the inferior mesenteric. The rectum (Fig. 1076) is supplied mainly bj- the superior hemor- rhoidal branch of the inferior mesenteric, but also at its lower end by the middle hemorrhoidal from the internal Uiac, and the inferior hemorhoidal from the internal pudic artery. The superior hemorrhoidal, the con- tinuation of the inferior mesen? teric, divides into two branches, which run down either side of the rectum to within abo
. Anatomy, descriptive and applied. Anatomy. 1312 THE ORGANS OF DIGESTION left colic branch of the inferior mesenteric, and the sigmoid flexure by the sigmoid branches of the inferior mesenteric. The rectum (Fig. 1076) is supplied mainly bj- the superior hemor- rhoidal branch of the inferior mesenteric, but also at its lower end by the middle hemorrhoidal from the internal Uiac, and the inferior hemorhoidal from the internal pudic artery. The superior hemorrhoidal, the con- tinuation of the inferior mesen? teric, divides into two branches, which run down either side of the rectum to within about five inches ( cm.) of the anus; they here split up into about six branches, which pierce the muscular coat and descend between it and the mucous membrane in a longitu- dinal direction, parallel with each other as far as the Internal sphincter, where they anastomose with the other hemorrhoidal arte- ries and form a series of loops around the anus. The veins of the large intestine correspond to the arteries and join the superior and inferior mesenteric veins which join the portal vein. The veins of the rectum (Fig. 1076) commence in a plexus of vessels which surrounds the lower ex- tremity of the intestinal canal. In the vessels forming this plexus are small saccular dilata- tions just within the margin of the anus (Figs. 1074 and 1076); from it about six vessels of con- siderable size are given off. These ascend between the mus- cular' and mucous coat for about five inches ( cm.), running parallel to each other; they then pierce the muscular coat, and, by their union, form a single trunk, the superior hemorrhoidal vein, which empties into the inferior mesenteric tributary of the portal vein. This arrange- ment is termed the hemorrhoidal plexus (Fig. 523); it communi- cates with the tributaries of the middle and inferior hemorrhoidal veins at its commencement, and thus a communication is established between the systemic and portal circulations. The inferior hemorrhoida
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
