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The mesentery of the sigmoid represents that which has been only partially disturbed by displacement or coalescence. The two branches of this S-iliac are a vertical primitive branch which inserts itself directly in the mid-dorsal line. This we will call the lower limb of the loop. The upper limb of the loop reaches from the lower pole of the kidney or still lower down to the point on the vertebral column where it converges with the vertical or primitive loop. The convengence of the upper and lower limbs of the sigmoid loop is on the vertebral column at a varying point according to age and individual differences. At the third fetal month, the rotating umbilical loop begins to drag on the mesentery of the descending colon. The dragging falls chiefly on a fold of the mesentery of the descending colon which may be called the ligamentum mesenterico-mesocolon, but which I
ROBINSON B. PERITONEAL SUPPORTS—(LIGAMENTUM PERITONEI.). JAMA. 1896;XXVI(12):560–565. doi:10.1001/jama.1896.02430640012001d
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