Archive image from page 1255 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( 1222 THE DIGESTIVE SYSTEM. blends with, the parietal peritoneum on the posterior abdominal wall, and is completely lost as a rule. The persistence of this mesentery, in a greater or less degree, explains the occasional presence of a descending mesocolon in the adult. Iliac Colon.—This corresponds to the portion of the ' sigmoid flexure ' which lies in the iliac fossa, and it has no mesentery. It is the direct continuation of the descending colon, with
Archive image from page 1255 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( 1222 THE DIGESTIVE SYSTEM. blends with, the parietal peritoneum on the posterior abdominal wall, and is completely lost as a rule. The persistence of this mesentery, in a greater or less degree, explains the occasional presence of a descending mesocolon in the adult. Iliac Colon.—This corresponds to the portion of the ' sigmoid flexure ' which lies in the iliac fossa, and it has no mesentery. It is the direct continuation of the descending colon, with which it agrees in every detail, except as regards its relations. Beginning at the crest of the ilium, it passes downwards and somewhat medially, lying in front of the iliacus muscle. A little way above the inguinal ligament it turns medially over the psoas major, and ends at the medial border of this muscle by dipping into the pelvis and becoming the pelvic colon (Fig. 958). It usually measures about 5 or 6 inches (12-5 to 15 cm.) in length, but it varies considerably in this respect. Fibro-cartilage between 4th and 5th lumbar vertebra; V. iliaca communis Pelvic mesocolon iliaca communis Commencement of iliac colon Sacculation Taenia anterior V. iliaca externa A. umbilicalis dextra Median umbilical ligament artery (urachus) \.. umbilicalis sinistra Urinary bladder, superior surface A. umbilicalis sinistra Fig. 958.—The Iliac and Pelvic Colon in situ. Relations.—Posteriorly, it lies upon, and, as a rule, is connected by areolar tissue to, the front of the ilio-psoas muscle. It also crosses the left ureter, the left internal spermatic vessels, and the femoral nerve. Anteriorly, it is usually covered by coils of small intestine, which hide it from view; but when distended, or when it occupies a lower position than usual, it comes into direct contact with the anterior abdominal wall. As a rule (90 per cent of bodies—Jonnesco), it is covered with peritoneum only on its
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