Arterial Blood Supply of the Appendix
The appendix is primarily supplied by the appendicular artery, which most commonly originates from the ileocolic artery (in approximately 80% of cases), and travels within the mesoappendix to reach the appendix 1.
Primary Blood Supply
The main appendicular artery arises from the ileocolic artery in the vast majority of individuals 1. This vessel courses through the mesoappendix—the peritoneal fold connecting the appendix to the terminal ileum and cecum—to deliver blood to the appendix along its length.
Accessory Arterial Supply
An accessory appendicular artery (AAA) is present in 13-40% of cases, representing an important anatomical variation 2, 1, 3, 4. When present, the AAA most commonly originates from:
- Posterior cecal artery (12.4% of all cases) 2
- Descending branch of the ileocolic artery (2%) 2
- Ileal branch of the ileocolic artery (0.7%) 2
- Less frequently: anterior cecal, common cecal, or ileocolic trunk 2
Studies from different populations show variable prevalence of dual blood supply, with approximately 39-40% demonstrating more than one appendicular artery in Indian and Zambian populations 3, 4.
Clinical Significance
Surgical Implications
Surgeons must be aware of potential accessory arterial supply during appendectomy to avoid intraoperative and postoperative hemorrhagic complications 2, 1. The 2020 WSES Jerusalem Guidelines address mesoappendix dissection techniques but emphasize that various methods (monopolar electrocoagulation, bipolar energy, clips, endoloops) can be used based on surgical judgment 5. The guidelines recommend monopolar electrocoagulation and bipolar energy as the most cost-effective approaches for mesoappendix dissection 5.
Anatomical Considerations
The mesoappendix extends along the full length of the appendix in 76% of cases 1. Understanding this anatomy is crucial because:
- The extent of mesoappendix attachment affects the degree of inflammation spread
- Accessory vessels within the mesoappendix may be encountered during dissection
- Inadequate hemostasis can lead to postoperative bleeding
Common Pitfall
Failure to identify and ligate an accessory appendicular artery can result in significant bleeding during or after appendectomy. Always inspect the mesoappendix carefully for additional vascular structures beyond the main appendicular artery, particularly branches from the posterior cecal artery.