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Muscle ... Origin ... Insertion ... Action
- Muscle - Rectus Abdominis
- Origin - Pubic Crest
- Insertion - Xiphoid Process of the Sternum and 5th, 6th, 7th Cartilages of the Ribs
- Action - Flexion of the Trunk and Compression of Abdominal Contents
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Muscle ... Origin ... Insertion ... Action
- Muscle - Internal Oblique
- Origin - Inguinal Ligament, Iliac Crest, Lumbar Fascia
- Insertion - Conjoint Tendon, Linea Alba (through the abdominal aponeurosis), and Lower 3 Ribs
- Action - Lateral Flexion and Rotation (when one side contracts), Compresses the Abdomen
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Muscle ... Origin ... Insertion ... Action
- Muscle - External Oblique
- Origin - Lower 8 Ribs
- Insertion - Anterior Half of Iliac Crest and Linea Alba (through the abdominal aponeurosis)
- Action - Lateral Flexion and Rotation (when one side contracts), Compresses the Abdomen
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Muscle ... Origin ... Insertion ... Action
- Muscle - Transverse Abdominis
- Origin - Anterior Iliac Crest, Lateral Inguinal Ligament, Thoracolumbar Fascia, Cartilage of Lower 6 Ribs
- Insertion - Abdominal Aponeurosis to Linea Alba
- Action - Compresses the Abdomen
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