Abdominal External Oblique Muscle


This is the Abdominal External Oblique Muscle!

AKA External Oblique Muscle (of abdomen)

The external oblique is situated on the lateral (outer) and anterior (front) parts of the abdomen.


  • the external surfaces and inferior borders of the fifth to twelfth ribs (lower eight ribs)


  • lowest ribs pass nearly vertically downward, and are inserted into the anterior half of the outer lip of the iliac crest
  • the middle and upper fibers, directed downward and forward, become aponeurotic (fibrous tissue similar to a tendon, but broader) at approximately the mid-clavicular line (a theoretical line running vertically down the surface of the body passing through the midpoint of the clavicle) and forms the anterior layer of the rectus sheath.


  • Pull the chest downwards and compress the abdominal cavity
  • Ipsilateral (same side) side-bending
  • Contralateral (opposite side) rotation.
  • So the right external oblique would side bend to the right and rotate to the left.

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