The external intercostal muscles are responsible for forced and quiet inhalation. They 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..
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What are intercostal muscles? Intercoastal muscles are of two types: External and internal. These are located in betweenthe ribs. The internal intercoastal muscles is .
There are three principal layers; External intercostal muscles aid in quiet and forced inhalation. They originate on ribs 1-11 and have their insertion on ribs 2-12..
The intercostal space. The intercostal space Fig. 3.3 contains the external intercostal, the internal intercostal and the innermost intercostal muscles arranged in .
When we exhale the diaphragm and intercostal muscles relax and return to their resting positions. This reduces the size of the thoracic cavity, thereby increasing the .