Abdomen:Muscles:Anterolateral abdominal muscles and aponeuroses

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

Figure 13.9 Anterior view of muscles forming the anterolateral abdominal wall Diagram

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Muscles of the Anterolateral Abdominal Wall - ScienceDirect