Abstract:156 abdominal preparations were explored by arteriography, corrosion and dissection. The arteria mesenterica inferior (AMI) ends by bifurcating into the two arteriae rectales superiores. The key to the interpretation of the AMI is the recognition of an arteria colosigmoidea that gives off one or more rami sigmoidei. In the presence of an arteria or ramus colic, sin. access, usually from the superior mesenteric artery, the left colic artery is absent, atrophic or displaced. The sigmoid branches (usually three) … Show more
“…The MCA branched from the IMA in one patient (0.5%), a pattern reported in 1.8%–5.0% of patients . An accessory MCA has been reported in 5%–8% of Western patients but in 49.2% of Japanese patients . These percentages differ markedly, and it is quite interesting that the prevalence among our study patients (6.8%) was quite close to that reported in Western patients.…”
“…The MCA branched from the IMA in one patient (0.5%), a pattern reported in 1.8%–5.0% of patients . An accessory MCA has been reported in 5%–8% of Western patients but in 49.2% of Japanese patients . These percentages differ markedly, and it is quite interesting that the prevalence among our study patients (6.8%) was quite close to that reported in Western patients.…”
“…Unilateral dissection alone may be sufficient to disrupt this tenuous collateral supply lead ing to poor perfusion, particularly of a long rectal stump and particularly in the midline anteriorly and posteriorly where there is already a relative paucity of vessels de rived from the superior rectal artery. These findings are in agreement, therefore, with the warning made by Vandamme et al [8] on the theoretical dangers of a long rectal stump. Ayouh [7] noted the functional importance of the junction between superior and middle rectal ves sels.…”
Section: Discussionsupporting
confidence: 92%
“…The rectal arteries represent a collateral arterial anastomosis between the branches of the internal iliac artery and the inferior mesenteric artery. The distribution of the superior rectal artery has been examined by other workers [5][6][7][8]. Our findings confirm the pattern of bifurcation and distribution to the postero-lateral surface of the rectal ampulla.…”
The blood supply of the ano-rectum has been studied in cadaveric specimens by angiographic methods. The vascular anastomosis between the middle rectal and superior rectal vessels was found to be demonstrable on one side only. There appears to be a midline paucity of vessels in both the posterior and anterior rectal walls, and this may be important in the aetiology of anastomotic dehiscence in low anterior resection.
“…Griffiths explained that the splenic flexure is the watershed area between the perfusion area of the MCA and the LCA [2]. Another artery, called the accessory middle colic artery (AMCA), running toward the splenic flexure has recently been recognized [3][4][5][6][7][8][9][10]. The AMCA usually originates from the superior mesenteric artery (SMA), running along the inferior border of the pancreas and toward the splenic flexure.…”
The presence of the AMCA is not rare and the AMCA has some branching patterns; therefore, recognizing it preoperatively and intra-operatively is important, being especially careful when the LCA is absent.
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