Muscles That Aid in Breathing
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| External intercostals | Origin: Inferior border of rib above
Insertion: Superior border of rib below
Action: Pulls ribs towards one another to elevate rib cage; Aid in inspiration (synergist to diaphragm)
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| Internal intercostals | Origin: Superior border of rib below
Insertion: Inferior border of rib above
Action: Draws ribs together to depress rib cage
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| Diaphragm | Origin: Inferior border of rib cage & sternum; Margins of thoracic cage
Insertion: Central tendon of diaphragm
Action: Contract to cause inspiration
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