Organ
Ileocecal junction
Small-to-large bowel transition with variable valve geometry
High-yield
The junction has functional control properties, but studies do not uniformly demonstrate a strong discrete sphincter like the pyloric ring. Its lips and the frenula joining them are distinct features.
Overview
The terminal ileum enters the cecum obliquely and projects into its lumen as the ileal papilla or valve. Mucosal lips, connective tissue and muscle contribute to the junction's shape and competence. Coordination with adjacent bowel helps govern emptying and limit reflux.
Reference facts
- Location
- Medial cecal wall where the terminal ileum enters the large bowel, usually in the right iliac fossa.
- Parts
- Superior and inferior lips border the opening; frenula extend from their junctions. Endoscopic shape varies with the living tissue and viewing conditions.
- Blood supply
- Ileocolic arterial branches from the superior mesenteric system.
- Innervation
- Enteric circuits interact with extrinsic superior mesenteric and vagal autonomic pathways.
- Relations
- The appendiceal opening lies inferior to the ileal entry on the medial/posteromedial cecal wall, with variable separation.
- Function
- Coordinates passage into the cecum and limits return of colonic contents, together with terminal ileal and cecal motor activity.
Clinical correlation
When the ileocecal junction prevents backward decompression, a distal colonic obstruction can create a closed loop and markedly distend the cecum. Large migrated gallstones also commonly lodge in the terminal ileal/ileocecal region.
Frequently asked questions
Where is the ileocecal junction located?
Medial cecal wall where the terminal ileum enters the large bowel, usually in the right iliac fossa.
What does the ileocecal junction do?
Coordinates passage into the cecum and limits return of colonic contents, together with terminal ileal and cecal motor activity.
What are the parts of the ileocecal junction?
Superior and inferior lips border the opening; frenula extend from their junctions. Endoscopic shape varies with the living tissue and viewing conditions.
What is the blood supply of the ileocecal junction?
The ileocecal junction is supplied by the ileocolic arterial branches from the superior mesenteric system.