Inhalation is aided by use of external intercostals,scalenesand sternocleidomastoid muscles.
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During quiet breathing, thescalenesare consistently phasically active, while the sternocleidomastoids are quiet.
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Breathing may be assisted by other muscles that can raise the ribs, such as sternocleidomastoid, pectoralis major and minor as well as thescalenes.
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