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Abdomen:Muscles:Anterolateral abdominal muscles and aponeuroses, RANZCRPart1 Wiki

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The external oblique muscle is the the largest and the most superficial (outermost) of the three flat muscles of the lateral anterior abdomen. It is thin and irregularly quadrilateral Function: pull the chest downwards and compress the abdominal cavity, which increases the intra-abdominal pressure as in a valsalva maneuver. Also limited actions in both flexion and rotation of the vertebral column. Origin: eight digitations from the external surfaces and inferior borders of the fifth to twelfth r