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Pectoralis Major (Clavicular Head)
Region: Shoulder & Arm Muscles · All shoulder & arm muscles
Pectoralis Major (Clavicular Head) at a glance
| Origin | Front surface of the medial half of the clavicle |
|---|---|
| Insertion | Lateral lip of the intertubercular groove of the humerus |
| Actions | Flexes the arm forward; Adducts and inwardly rotates the arm |
| Nerve supply | Lateral pectoral nerve (C5–C7) |
◆ Good to know
Listed separately because clinicians test it on its own: resisted arm flexion against the chest wall isolates this head from the sternocostal part.
More Shoulder & Arm Muscles
Please note: This page is an anatomy education summary for students and curious readers, not medical advice. Attachment points are given in their classic short form; individual anatomy varies, and detailed dissection-level descriptions belong in an anatomy atlas.