Intercostal muscles and the superior serratus posterior muscles will act to pull the ribs outwards and upwards by which group of skeletal muscles during inhalation.
Dome shaped sheet like structure of muscles that separates the chest cavity from the abdomen is the most important muscle used for breathing in like inhalation and exhalation . The process of breathing out is passive when a person is not exercising.
Thoracic muscles which are raising the rib-cage are external intercostal muscles.The muscles of respiration are the muscles that contribute to inhalation and exhalation by aiding in the expansion and contraction of the thoracic cavity.
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