how intercostal muscles work
Intercostal muscles are muscle groups that are situated in between the ribs that create and move the chest wall. The muscles are broken down into three layers, and are primarily used to assist with the breathing process.hey raise the ribs and expand the chest cavity, and originate from ribs one through 11, with insertion from ribs two to 12. The internal intercostal muscles are responsible for forced exhalation. They depress the ribs and decrease space in the chest cavity.