Appendix Positions

Appendix Positions using a clock: High yield info about the appendix - read below 👇🏼

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✅ Overview

The large intestine consist of several parts including the cecum. Attached to the posteromedial end of the cecum is a narrow tube referred to as the Appendix!

The appendix has no vital function and it is supported by the mesoappendix, which is a fold that suspends it from the terminal ileum.

✅ Clock Face Positions

*Pre-ileal: Anterior to the terminal ileum at 1 or 2 o’clock

*Post-ileal: Posterior to the terminal ileum at 1 or 2 o’clock

*Sub-ileal: Parallel with the terminal ileum at 3 o’clock

*Pelvic: Descending over the pelvic brim at 5 o’clock

*Subcecal: Below the cecum at 6 o’clock

*Paracecal: alongside the lateral border of the cecum at 10 o’clock

*Retrocecal: behind the cecum at 11 o’clock (also known as the most common position of the appendix)

✅ High Yield Facts

Embryonic origin: derived from midgut (so we will see superior mesenteric vessels)

*Arterial supply: appendicular artery - from ileocolic artery - from superior mesenteric artery.
*Venous drainage: appendicular vein
*Innervation: Ilecolic branch of the superior mesenteric plexus (travels with the ilecolic artery)
*Lymphatic drainage: lymph drains from the appendix into the lymph nodes within the mesoappendix & into ilecolic lymph nodes (which surround the ilecolic artery)

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