Respiratory muscles

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The respiratory muscles are those skeletal muscles that lead to an expansion or narrowing of the chest and thus to inhalation or exhalation . The most important respiratory muscle is the diaphragm ( diaphragm ), further including the intercostal muscles and lower intercostal muscles and the accessory respiratory muscles to respiratory muscles. The muscles that come into action depend heavily on the breathing technique ( chest breathing or abdominal breathing ).

In normal breathing, the muscles only play a role for inspiration (inhalation). This requires an expansion of the chest, which is achieved by so-called inspiratory muscles ("inspirators"). They create an increased negative pressure in the pleural space and thus an expansion of the lungs , whereby air is sucked in. Exhalation, on the other hand, is mostly passive by slackening these muscles. Due to the elastic fibers in the lung tissue, it contracts and presses the air out of the lungs. Only with increased breathing or with lung diseases must the exhalation also be supported by auxiliary muscles ( expiratory muscles , "expirators").

Inspiratory muscles (inhalation)

Auxiliary inspiratory muscles (inhalation)

Expiratory muscles (exhalation)

Auxiliary expiratory muscles (exhalation)

The expiratory auxiliary breathing muscles support exhalation ( auxiliary breathing ):