| 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) |
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| 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) |
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| middle rectal 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 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) |
| middle haemorrhoidal veins | An obsolete term for middle rectal veins. (05 Mar 2000) |
| autonomic plexuses | Plexus's of nerves in relation to blood vessels and viscera, the component fibres of which are sympathetic, parasympathetic, and sensory. Synonym: plexus autonomici. (05 Mar 2000) |
| ganglia of autonomic plexuses | Autonomic ganglia lying in plexuses of autonomic fibres, e.g., the coeliac and inferior mesenteric ganglia of the sympathetic, and the small parasympathetic ganglia of the myenteric plexus. Synonym: ganglia plexuum autonomicorum. (05 Mar 2000) |
| gastric plexuses of autonomic system | The plexus's along the greater and lesser curvatures of the stomach derived from the coeliac plexus; also known as inferior and superior plexus. Synonym: plexus gastrici systematis autonomici. (05 Mar 2000) |
| rectal plexuses | See: inferior rectal plexuses, middle rectal plexuses, superior rectal plexus. (05 Mar 2000) |
| sympathetic plexuses | Autonomic plexuses, in which postsynaptic sympathetic nerve fibres are predominant. (05 Mar 2000) |
| inferior rectal plexuses | The autonomic plexus's along the anus derived from the inferior hypogastric plexus. Synonym: plexus rectales inferiores, inferior haemorrhoidal plexuses. (05 Mar 2000) |
| 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) |
| 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) |