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The intercostal muscles. Intercostal means "between ribs".
There are 11 pairs of intercostal muscles on each side (22 total muscles). The intercostal muscles lie between the ribs.
intercostal muscle
The Phrenic Nerve-Diaphragm and the External Intercostal Nerve-External intercostal muscles
The internal intercostal muscles relax and the external intercostal muscles contract, pulling the ribcage upwards and outwards.
There are several muscles that are responsible for breathing. They are the Diaphragm, the external intercostal muscle, and the internal intercostal muscle.
Intercostal Muscles
Intercostal muscles are several groups of muscles that run between the ribs, and help form and move the chestwall. The intercostal muscles are mainly involved in the mechanical aspect of breathing. These muscles help expand and shrink the size of the chest cavity to facilitate breathing.
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The diaphragm (a sheet of muscle underneath the ribcage) and intercostal muscles (located between your ribs).
Diaphragm and intercostal muscles.
External intercostal muscles are the ones between the ribs that help elevate them during inspiration.