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Anatomy of the Thorax (muscles (internal thoracic wall muscles…

- - - - pectoralis major
        
        attachments: clavicle, sternum, humerus
        
        nerve supply: 1) lateral pectoral nerve, 2) medial pectoral nerve
        
        blood supply: thoracoacromial artery
        
        function: adduction of the arm and thorax
    - - pectoralis minor
        
        function: depresses and pulls forward the scapula
        
        attachments: scapula, ribs 3-5
        
        nerve supply:
        
        blood supply:
      - subclavius
      - serratus anterior
- - - - ribs 1 to 7
      - connected to vertebrae and to the sternum via hyaline cartilage called the costal cartilage
    - - ribs 11 to 12
      - not connected to the sternum at all
    - - ribs 8 to 10
      - connected to the vertebrae and to the costal cartilage of rib 7's costal cartilage connection to the sternum