(From Mesocolon 4946 the middle, and the colon). When the mesentery has reached the extremity of the ilium, it contracts and becomes the mesocolon. One lamina, turned to the right side, is called the right ligament of the colon. The mesocolon then rising to the right kidney, seems to be lost by the adhesion of the colon to the kidney and the first curvature of the duodenum; a circumstance which explains the utility of purgatives in nephritic cases. When it again appears, its breadth increases, and it passes under the stomach, liver, and spleen, downwards to the left kidney. The circumference, at this part, is very little plaited, and the colon is affixed to it, so as to hide the ligamentary band at its smaller curvature. By its smaller circumference it incloses the duodenum in the triangular sheath, already described, and, by its larger, the colon, forming in its passage a slight adhesion to the greater curvature of the stomach.

It contracts below the left kidney, forming the liga-mentum coli sinistrum, and then expands again, fixed to the convolutions of the colon as in the superior portions. See Mesenterium.