| haemorrhoidal | 1. Of or pertaining to, or of the nature of, haemorrhoids. 2. <anatomy> Of or pertaining to the rectum; rectal; as, the hemorrhoidal arteries, veins, and nerves. Origin: Cf. F. Hemorroidal, hemorrhoidal. (01 Dec 1998) |
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| haemorrhoidal nerves | See: superior rectal plexus, middle rectal plexuses, inferior rectal nerves. (05 Mar 2000) |
| haemorrhoidal plexus | A venous plexus resting upon the posterior and lateral walls of the rectum; it drains into the superior rectal vein to the portal, the middle rectal to the internal iliac and the inferior rectal to the internal pudendal. Synonym: plexus venosus rectalis, haemorrhoidal plexus. (05 Mar 2000) |
| haemorrhoidal veins | An obsolete term for rectal veins. See: inferior rectal veins, middle rectal veins, superior rectal vein. (05 Mar 2000) |
| haemorrhoidal zone | The part of the anal canal that contains the rectal venous plexus. Synonym: annulus haemorrhoidalis, zona haemorrhoidalis. (05 Mar 2000) |
| middle haemorrhoidal artery | <anatomy, artery> Origin, internal iliac; distribution, middle portion of rectum; anastomoses, inferior rectal and superior rectal. Because the latter is a tributary of the portal system, this is a portosystemic or portocaval anastomosis. Synonym: arteria rectalis media, middle haemorrhoidal artery. (05 Mar 2000) |
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| middle haemorrhoidal plexuses | The autonomic plexus's along the rectum derived from the inferior hypogastric plexus. Synonym: plexus rectales medii, middle haemorrhoidal plexuses. (05 Mar 2000) |
| middle haemorrhoidal veins | An obsolete term for middle rectal veins. (05 Mar 2000) |
| superior haemorrhoidal artery | <anatomy, artery> Origin, inferior mesenteric; distribution, upper part of rectum; anastomoses, middle and inferior rectal. As a tributary of the portal vein, its anastomosis with these arteries forms a portosystemic or portocaval anastomosis. Synonym: arteria rectalis superior, superior haemorrhoidal artery. (05 Mar 2000) |
| superior haemorrhoidal plexus | The autonomic plexus derived as a continuation of the inferior mesenteric plexus that accompanies the superior rectal artery. Synonym: plexus rectalis superior, superior haemorrhoidal plexus. (05 Mar 2000) |
| superior haemorrhoidal vein | <anatomy, vein> Outmoded term for superior rectal vein. (05 Mar 2000) |
| Quenu's haemorrhoidal plexus | Lymphatic plexus's in the skin about the anus. (05 Mar 2000) |
| inferior haemorrhoidal artery | <anatomy, artery> Origin, internal pudendal; distribution, anal canal, muscles and skin of the anal region, and skin of the buttock; anastomoses, middle rectal, perineal, and gluteal. Synonym: arteria rectalis inferior, inferior haemorrhoidal artery. (05 Mar 2000) |
| inferior haemorrhoidal nerves | Several branches of the pudendal nerve that pass to the external and sphincter anoderm and skin of the anal region. Synonym: nervi rectales inferiores, inferior haemorrhoidal nerves. (05 Mar 2000) |
| inferior haemorrhoidal plexuses | The autonomic plexus's along the anus derived from the inferior hypogastric plexus. Synonym: plexus rectales inferiores, inferior haemorrhoidal plexuses. (05 Mar 2000) |
| inferior haemorrhoidal veins | An obsolete term for inferior rectal veins. (05 Mar 2000) |