Expiration Articles

Primary and Accessory Ventilatory Muscles

By Carolyn Kisner PT, MS and Lynn Allen Colby PT, MS on January 28th 2009

Inspiration
• Primary muscles: diaphragm, scalenes, parasternals
• Accessory muscles: sternocleidomastoids, upper trapezius, pectoralis major and minor, subclavius, and possibly the external intercostals
Expiration
• Primary muscles: none active during tidal (resting) expiration
• Accessory muscles: abdominals including the rectus abdominis, transversus abdominis, and internal and external obliques; pectoralis major; and possibly the internal intercostals
Parasternal intercostals. The parasternals, a portion […]

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Filed Under: Jeff, Physical Therapy
Tags: abdominals, Expiration, Inspiration

Muscles of Ventilation

By admin on January 27th 2009

Multiple muscles attaching to the thoracic cage have an impact on the movement of air in and out of the lungs during either the inspiratory or expiratory phases of breathing.
Ventilatory muscles, also referred to as respiratory muscles, are classified as primary or accessory. The primary muscles of ventilation are recruited during quiet (tidal) breathing, whereas […]

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Filed Under: Jeff, Physical Therapy
Tags: diaphragm, Expiration, Inspiration, Ventilation

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