1. Deltoid - Anterior Head Origin Lateral third of clavicle Insertion Deltoid tuberosity of the humerus Action - Shoulder flexion
- Medial shoulder rotation
- Horizontal shoulder flexion
2. Deltoid - Medial Head Origin Acromion of scapula Insertion Deltoid tuberosity of the humerus Action 3. Deltoid - Posterior Head Origin Spine of scapula Insertion Deltoid tuberosity of the humerus Action - Shoulder extension
- Horizontal shoulder extension
- Lateral shoulder rotation
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