Mesoappendix

mesoappendix

The mesoappendix is the triangular peritoneal fold attaching the appendix to the terminal ileum mesentery, containing the appendicular artery (a branch of the ileocolic artery) and appendicular vein.

Region: Abdomen

Biomechanics

Function & Actions

Provides the vascular supply to the appendix via the appendicular artery, suspends the appendix from the terminal ileum, and provides the surgical pedicle divided during appendectomy.

Clinical Relevance

Clinical Notes

The mesoappendix is divided during appendectomy — laparoscopically using an endoscopic stapler or bipolar energy. The appendicular artery tip (often the last vessel before the appendix tip) must be included in the division to prevent post-operative bleeding. In gangrenous appendicitis, the mesoappendix becomes thickened and friable, requiring careful haemostasis.

Pathology

Common Injuries & Conditions

Mesoappendix Division in Appendectomy

The mesoappendix is divided between clips or with an endoscopic stapler during appendectomy, with care to include the appendicular artery tip to prevent post-operative haemorrhage.

Mesoappendix Pathology in Advanced Appendicitis

Gangrenous appendicitis producing mesoappendix oedema and necrosis, requiring careful division with attention to the fragile tissue to avoid inadvertent vascular injury.