Intercostal refers to the spaces between ribs. A stitch is where a build up of lactic acid and lack of oxygen causes a muscle to spasm and cause a lot of pain and usually occurs during exercise. So...
Intercostal muscles are several groups of muscles that run between the ribs, and help form and move the chest wall.
There are three principal layers;
* the external intercostal muscles, which aid...
when we breath in.
the intercostal muscles contract.these pull the ribcage upwards.so the chest increases in volume
when we breath out.
the intercostal muscles relax which lowers the ribcage.the...