Pectoralis major
- Origin - Medial half of clavicle; manubrium and body of sternum; upper six costal cartilages
- Insertion - Lateral lip of intertubercular groove of humerus
- Nerve - Lateral and medial pectoral
- Action - Flexes, adducts, and medially rotates arm
Pectoralis minor
- Origin - Third, fourth, and fifth ribs
- Insertion - Coracoid process of scapula
- Nerve - Medial (and lateral) pectoral
- Action - Depresses scapula; elevates ribs
Subclavius
- Origin - Junction of first rib and costal cartilage
- Insertion - Inferior surface of clavicle
- Nerve - Nerve to subclavius
- Action - Depresses lateral part of clavicle
Serratus anterior
- Origin - Upper eight ribs
- Insertion - Medial border of scapula
Long thoracic
- Action - Rotates scapula upward; abducts scapula with arm and elevates it above the horizontal
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