. On retro-peritoneal hernia . FjG. 23 OK THK ArTERY AND ITS BRANCHES. junction, and gives branches to the Ccecuni, to the ascendingcolon, and very much smaller twigs to the anterior surfaceof the illeum. In a certain number of cases the largestbranch of this second vessel is a lateral one, which runs tothe right on to the ascending colon, forming in its course awell-defined curve with the concavity directed upwards andto the right. 76 THE CMCUM AND VERMIFORM APPENDIX The posterior branches are : (i) A branch running upwardsto anastomose with the right coKc artery ; (2) a
. On retro-peritoneal hernia . FjG. 23 OK THK ArTERY AND ITS BRANCHES. junction, and gives branches to the Ccecuni, to the ascendingcolon, and very much smaller twigs to the anterior surfaceof the illeum. In a certain number of cases the largestbranch of this second vessel is a lateral one, which runs tothe right on to the ascending colon, forming in its course awell-defined curve with the concavity directed upwards andto the right. 76 THE CMCUM AND VERMIFORM APPENDIX The posterior branches are : (i) A branch running upwardsto anastomose with the right coKc artery ; (2) a branch whichruns to the posterior aspect of the angle of junction of theileum with the colon, distributing branches to the caecumand colon; and (3) the appendicular artery which runs behindthe ileum, in the meso-appendix, to the tip of the vermiform. Fig. 24.—Diagram of the Ileo-Colic Artery and its Branches whenTHE Appendicular Artery Lies in Front of the Ileum. process. The chief branch of this last vessel is one whicharises at, or very near to, the lower margin of the ileum, andruns with a curve downwards and to the right, and againarches upwards and to the left between the layers of the bloodless fold of Treves near the free edge. The importanceof these vessels becomes apparent when we study the foldsand fossae. THE FOLDS AND FOSSM 77 THE FOLDS AND FOSS^. The primary folds are : 1. The anterior vascular, or ileo-colic fold. 2. The accessory anterior vascular fold. 3. The intermediate, or ileo-appendicular fold. 4. The posterior vascular fold, or meso-appendix. The fossae formed by them are: 1. The anterior vascular, or ileo-colic fossa. 2. The accessory anterior vascular fossa. 3. The ileo-appendicular fossa. In about 5 per cent, of cases there is found to be a thirdfossa between the termination of the enteric mesentery andt
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