external oblique (muscle)

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ex·ter·nal ob·lique (mus·cle)

flat muscle of abdomen; origin, external surfaces of fifth to twelfth ribs; insertion, anterior half of lateral lip of iliac crest and inguinal ligament inferiorly, and continuing medially as part of the anterior layer of the rectus sheath; action, supports and compresses abdominal viscera; flexes and rotates trunk; nerve supply, thoracoabdominal nerves.
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