accessory muscle of respiration

accessory muscle of respiration

any of the muscles of the neck, back, and abdomen that may assist the diaphragm and the internal and external intercostal muscles in respiration, especially in some breathing disorders or during exercise. Often elevated effort of breathing contributes to increased anterior-posterior diameter of the chest (barrel chest) over time.

accessory muscle of respiration

Any of the muscles that are recruited to increase ventilation by patients with labored breathing. The sternocleidomastoids, scalenes, and pectoralis minors may be used for a more forceful inhalation; the abdominal muscles may be used for a more forceful exhalation. Their use represents an abnormal or labored breathing pattern and is a sign of respiratory distress.