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Trapezius
Region: Back Muscles · All back muscles
Trapezius at a glance
| Origin | Superior nuchal line, external occipital protuberance, ligamentum nuchae and spinous processes of C7–T12 |
|---|---|
| Insertion | Lateral third of the clavicle, acromion and spine of the scapula |
| Actions | Elevates, retracts and depresses the shoulder blade; Rotates the scapula upward (with serratus anterior); Extends the neck |
| Nerve supply | Accessory nerve (CN XI), with C3–C4 branches |
◆ Good to know
Damage to the accessory nerve in the posterior triangle (for example after lymph node biopsy) causes shoulder droop and weak shrugging on that side.
More Back 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.