Describe the location and arrangement of the subcostal muscles
Thin muscles, inner surface of posterior thoracic wall, bridging two or three intercostal spaces
Serratus posterior inferior
Bottom of the rib cage, posterior side, travelling upward and outward
Serratus posterior superior
Top of the rib cage, posterior side
Levatores costarum
Run on posterior side of rib cage, just lateral to vertebrae
Transversus thoracis
Parasternal borders, pull ribs towards sternum during forced expiration