The external intercostals elevate the rib cage during inspiration.
The respiratory muscles have a mechanical function, that of expanding the rib cage to favor the entry of air.
The external intercostals are occupying the intercostal spaces and are oriented downwards and backwards, leaving the last part of the intercostal space free.
- During air intake or inspiration, the diaphragm contracts moving downward, allowing the rib cage to widen and air into the lungs.
- The external intercostals simultaneously lift the ribs and sternum allowing the diameter of the rib cage to increase.
Therefore, we can conclude that the external intercostals elevate the rib cage during inspiration.
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