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Muscle Group 8

Muscles That Aid in Breathing

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)
Internal intercostals Origin: Superior border of rib below Insertion: Inferior border of rib above Action: Draws ribs together to depress rib cage
Diaphragm Origin: Inferior border of rib cage & sternum; Margins of thoracic cage Insertion: Central tendon of diaphragm Action: Contract to cause inspiration
Created by: michael.itonaga