what is the insertion of the pectoralis minor
The pectoralis minor muscle inserts on the coracoid process of the scapula.
Anatomy Basics
This small, triangular muscle lies deep to the larger pectoralis major in the upper chest. It originates from the anterior surfaces and upper borders of ribs 3, 4, and 5 (near their costal cartilages) and converges into a flat tendon that attaches to the medial border and superior surface of the scapula's coracoid process. This insertion point makes it a key stabilizer for shoulder movements, pulling the scapula forward and downward during actions like protraction or reaching overhead.
Clinical Relevance
In physical therapy or sports medicine, tightness here can contribute to forward shoulder posture or thoracic outlet issues, as it forms a "bridge" under which nerves and vessels pass. Surgeons reference it during procedures like coracoid transfers for shoulder instability.
Quick Facts Table
| Feature | Details |
|---|---|
| Insertion | Coracoid process (medial border, upper surface) of scapula |
| Origin | Ribs 3-5 (anterior surface, costal cartilages) |
| Actions | Scapular protraction, depression, downward rotation; rib elevation |
| Innervation | Medial/lateral pectoral nerves (C5-T1) |
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