THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The muscles that make up the thorax wall include the three intercostal muscles (external, internal, and innermost), the subcostalis, and the transversus thoracis. Eleven pairs of intercostal muscles are in each of the intercostal spaces, arranged from superficial to deep.

Detailed explanation-2: -Your intercostal muscles are the muscles between your ribs. They allow your ribcage to expand and contract so you can breathe. But if they stretch too far or tear, intercostal muscle strain is the end result. You can strain the intercostal muscles suddenly or by doing certain movements over and over.

Detailed explanation-3: -Intercostal muscles are many different groups of muscles that run between the ribs, and help form and move the chest wall. The intercostal muscles are mainly involved in the mechanical aspect of breathing by helping expand and shrink the size of the chest cavity.