1. External Oblique Origin Anterior angles of the lower eight ribs Insertion Linea alba, pubic crest and tubercle, anterior superior iliac spine and anterior half of iliac crest Action - Trunk rotation
- Lateral trunk flexion
2. Internal Oblique Origin Thoracolumbar fascia, anterior 2/3 of the iliac crest, lateral 2/3 of the inguinal ligament Insertion Inferior borders of ribs 8-12, linea alba and pubic crest Action - Trunk rotation
- Trunk flexion
- Lateral trunk flexion
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