|Function:||Protracts scapula, assists in inspiration|
|Origin:||Third to fifth ribs|
|Insertion:||Medial and upper surface of the coracoid process of the scapula|
|Innervation:||Medial pectoral nerve and lateral pectoral nerve (C5 - T1)|
|Search for Pectoralis minor in Gray's.|
Pectoralis minor is situated beneath pectoralis major on the anterior chest wall. Its fibres pass superolaterally to converge into a flat tendon.
Pectoralis minor is a major landmark of the axilla.
- Protraction of the scapula
- Aids in respiration if the scapula is fixed
- Third, fourth and fifth ribs
- May originate from second rib or any combination of second to fifth
- The tendon may extend superiorly over the coracoid process to the greater tubercle
- May be split into several separate muscles or heads
- Rarely absent
- A separate muscle, pectoralis minimus, may rarely run from the first rib to the coracoid process.