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Pectoralis Minor
From WikiMSK
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| Pectoralis Minor | |
|---|---|
| Muscle Type | |
| Origin | Superior margins, outer surfaces of 3-5th ribs near cartilages. Also fascia over corresponding intercostal muscles |
| Insertion | Medial boder, superior surface of coracoid process of scapula |
| Action | Origin fixed: Tilts scapula anteriorly (i.e. in coronal plane, coracoid process moves anteriorly and caudally, inferior angle moves posteriorly and medially.
Insertion stabilised: assists in forced inspiration |
| Synergists | |
| Antagonists | |
| Spinal innervation | C6, C7, C8, T1 |
| Peripheral Innervation | Medial Pectoral Nerve, plus fibres from communicating branch of Lateral Pectoral Nerve |
| Vasculature | |
Manual Muscle Testing
Patient: Supine
Test: Forward thrust of shoulder. The arm is adducted to the side of the body. Patient should avoid pushing down with their hand.
Pressure: Against anterior aspect of shoulder, pushing downwards towards table.
