Meckels Diverticulum

A Meckel's diverticulum represents a remnant of the omphalomesenteric (vitelline) duct.5,6 This pouchlike persistence had the same anatomic structure as the remainder of the intestine, and thus contains all four his-tologic layers. Meckel's diverticulum is supplied by the remnants of a nonbranching primitive vitelline artery that arises from an ileal artery7,8 (Fig. 14-18). It generally follows the "rule of twos": it is present in 2% of people, averages 2 in. in length, and is found in the distal ileum about 2 ft proximal to the ileocecal valve.

The radiologic hallmark of a Meckel's diverticulum2,9 is thus based on its identification as a saccule extending precisely from the antimesenteric, convex border of a terminal ileal loop (Figs. 14-19 through 14-22), usually in the right lower quadrant. This can be seen in almost two-thirds of instances.2 Because of the variability in position of small bowel loops, the segment from which a Meckel's diverticulum arises may, at times, project within other areas of the abdomen,10 but its localization nevertheless to the antimesenteric border can be of great diagnostic value (Fig. 14-23).

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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