Pectoralis Minor
Musculus pectoralis minor
The pectoralis minor is a thin triangular muscle deep to the pectoralis major that stabilizes the scapula by drawing it forward, down, and into anterior tilt against the rib cage. It forms part of the anterior axillary wall and is a key landmark for the axillary artery and lymph nodes. Chronic tightness from rounded-shoulder posture can contribute to scapular dyskinesis and shoulder impingement, making it a frequent target of mobility and stretching work.
- Actions
- Scapular protraction (abduction), Scapular depression, Scapular downward rotation, Anterior tilt of the scapula, Rib elevation (accessory inspiration when scapula fixed)
- Origin
- Outer surfaces of the 3rd to 5th ribs near the costochondral junctions
- Insertion
- Medial border and superior surface of the coracoid process of the scapula
- Innervation
- Medial pectoral nerve (C8-T1)
- Blood supply
- Pectoral branch of the thoracoacromial trunk; lateral thoracic artery
Antagonists Trapezius
Tendons Pectoralis Minor Tendon
Exercises (7)
Assists in