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(a) Ideal arrangement of vessels, they should be of similar length and preferably lie parallel to each other. If they are crossing each other one should make sure that the artery is not compressing the vein. (b) The vein crossing the artery but the lie is comfortable. (c and d) If the length of the vein and the artery are different the longer vessel tends to kink. In the figures shown the vein on either side can have this tendency if left longer than artery
