They also act as accessory muscles of inspiration, along with the sternocleidomastoids.

The accessory muscles of inspiration can also become engaged in everyday breathing when a breathing pattern disorder exists.

If a breathing pattern disorder exists, as in the event of an asthma attack, the accessory muscles of inspiration may become overused.

Symptoms include chest tightness, rapidly progressive dyspnea (shortness of breath), dry cough, use of accessory muscles, labored breathing and extreme wheezing.

The mechanism of breathing depends on our primary and accessory respiratory muscles.

The accessory muscles of respiration are much smaller.

Forced inspiration for speech uses accessory muscles to elevate the rib cage and enlarge the thoracic cavity in the vertical and lateral dimensions.

The rib cage itself is also able to expand and contract to some degree, through the action of other respiratory and accessory respiratory muscles.

It also acts as an accessory muscle of inspiration, along with the scalene muscles of the neck.

The use of "accessory" muscles, such as the neck muscles, during quiet breathing.