Anatomy study note · Abdomen

Appendix

A narrow, blind muscular tube, 8–13 cm long and rich in lymphoid tissue, attached to the posteromedial caecum about 2.5 cm below the ileocaecal junction.

Key points

• Base at McBurney point (1/3 from ASIS to umbilicus).
• Appendicular artery (from posterior caecal) = end artery → gangrene/perforation.
• Commonest positions: pelvic and retrocaecal.
• Pain: umbilicus (T10) → right iliac fossa.
• Appendix: distal caecal bud; base moves medially.
• Appendix: lots of lymphoid nodules, shallow crypts.

The full note in the atlas also covers

Features · Blood supply · Nerve supply · Lymph drainage · Histology · Development · Clinical notes

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 7, PDF pp. 864–866, 875–876
• Inderbir Singh’s Human Embryology, ch. 13, PDF pp. 182–183
• BRS Cell Biology & Histology, 7th ed., ch. 16, PDF p. 299

More from the abdomen

• Ascending colon
• Biliary tree
• Caecum
• Coeliac trunk
• Descending colon
• Duodenum
• Epididymis
• External oblique
• Gallbladder
• Iliac arteries
• Iliacus
• Iliohypogastric and ilioinguinal nerves

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