Inframesocolic space

The inframesocolic space is the intraperitoneal space below the root of the transverse mesocolon. The supramesocolic space lies above the transverse mesocolon's root.

Gross anatomy

The compartment can be divided into two unequal spaces posteriorly by the mesentery of the small bowel as it runs from the duodenojejunal flexure in the left upper quadrant to the ileocaecal valve in the right lower quadrant.

The right inframesocolic space is smaller than its left counterpart. It is bounded by the transverse colon anterosuperiorly, the mesentry of the ascending dolon on the right, the root of the small bowel mesentery on the left and the apex lying inferiorly at the ileocaecal junction. Upon examintion of the floor of the triangle the lower pole of the right kidney can be felt on the right side. Just to the left of this, the descending part of the duodenum (D2) turns transversely turning into the transverse duodenum (D3).

It is important to note that fluid tracking down from the right inframesocolic space into the pelvis must pass forwards over the lower ileum. This is compared to the left inframesocolic space where there is free passage to the pelvis.

The left inframesocolic space is quadrilateral in shape and is the larger of the two compartments. It is in free communication with the pelvic peritoneal space on the right of the midline. The sigmoid colon and its associated mesentery form a partial barrier on the left of the midline. The upper border of the space is the attachment of the transverse mesocolon, the left border is the mesentry of the descending colon, the right border is the root of the small bowel mesentry. 

The inframesocolic space also contains the right and left paracolic gutters which are peritoneal recesses on the posterior abdominal wall lateral to the ascending and descending colon respectively. The right paracolic gutter is continuous superiorly with the right subhepatic and subphrenic spaces. It is larger than the left paracolic gutter, which is partially separated from the left subphrenic spaces by the phrenicocolic ligament. Both paracolic spaces are in continuity with the pelvic peritoneal spaces.

Abdominal and pelvic anatomy
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Article information

rID: 5707
Section: Anatomy
Tag: refs
Synonyms or Alternate Spellings:

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