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Deltoid (Posterior Part)
Region: Shoulder & Arm Muscles · All shoulder & arm muscles
Deltoid (Posterior Part) at a glance
| Origin | Spine of the scapula and acromion (posterior fibres) |
|---|---|
| Insertion | Deltoid tuberosity of the humerus |
| Actions | Extends the arm backward; Rotates the arm outward |
| Nerve supply | Axillary nerve (C5–C6) |
◆ Good to know
The posterior deltoid is the part tested when a patient pushes the arm back against resistance; it balances the anterior (flexor) fibres.
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.