Abdomen

M. Obliquus externus abdominis

Function: compression of the abdominal viscera

Origin: Last few ribs and thoracolumbar fascia

Insertion: Linea alba, brim of pelvis, tuber coxae

Function: flexes the trunk, forced expiration, micturition, defecation

Origin: Tuber coxae and transverse processes of the lumbar

Insertion: Linea alba, caudal ribs, brim of pelvis

Function: stabilize the trunk and maintain internal abdominal pressure

Origin: Deep thoracolumbar fascia, caudal ribs, lumbar vertebrae

Insertion: Linea alba

Function: flexes spine

Origin: Costal cartilage and sternum

Insertion: Pubis via the pre pubic tendon

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