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External intercostals

Origin: Rib


Insertion: Rib


Action: Pull ribs toward one another to elevate rib cage


Aid in inspiration

Internal intercostals

Origin: rib


Insertion: rib


Action: draws ribs together to depress the rib cage


Aid in expiration

Diaphragm

Origin: inferior border of rib cage and sternum


Margins of thoracic cage


Insertion: central tendon of diaphragm


Action: Contracts to cause inspiration