Which of the following muscles is considered a primary muscle of inspiration?

Question

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The main inspiratory muscle is the diaphragm, which contributes almost three quarters of the inspiratory capacity and increases the vertical dimension of the thorax. Cervical nerves 3 to 5 contribute to form the phrenic nerve, which drives the diaphragm. Additional inspiratory force is provided by the external intercostal muscles, which contract to expand the rib cage during inspiration. The innervation of the intercostal muscles occurs via the intercostal nerves, which come off the thoracic spinal nerve roots.

Which of the Following Muscles Is Considered a Primary Muscle