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Table of Contents > Health Dictionary > Internal oblique

Internal oblique

Flat muscle of anterolateral abdominal wall; origin, iliac fascia deep to lateral part of inguinal ligament, anterior half of crest of ilium, and lumbar fascia; insertion, tenth to twelfth ribs, with aponeurosis contributing to the sheath of rectus; some of the fibers from inguinal ligament terminate in the conjoint tendon; action, diminishes capacity of abdomen, flexes lumbar vertebral column (bends thorax forward); nerve supply, lower thoracic.
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