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External intercostal origin
Inferior surface of rib above


External intercostal insertion
Superior surface of rib below


External intercostal actions
Elevates rib cage

Internal intercostal origin
Superior surface of rib below


Internal intercostal insertion
Inferior surface of rib above


Internal intercostal actions
Depresses rib cage

Diaphragm origin
Xiphoid process, Lower ribs, First lumbar vertebra


Diaphragm insertion
Central tendon


Diaphragm actions
Flattens on contraction

Rectus abdominis origin
Superior surface of pubic bone


Rectus abdominis insertion
Xiphoid process, Costal cartilage of ribs 5-7


Rectus abdominis actions
Flex and rotate lumbar region of vertebrae, Increase intra-abdominal pressure, Stabilisation

Transverse abdominis actions
Maintain tone in core, help compress ribs