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Trapezius
- Origin: Occipital bone, cervical & thoracic vertebrae
- Insertion: Clavicle acromion, & spine of scapula
- Action: Elevation, depression & retraction (adduction) of scapula
- Innervation: CN XI
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Latissimus dorsi
- Origin: Lower thoracic & lumbar vertebrae & iliac crest
- Insertion: Intertubercular groove of humerus
- Action: Extension, adduction, & medial rotation of shoulder joint
- Innervation: Thoracodorsal nerve
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Levator scapulae
- Origin: Upper cervical vertebrae
- Insertion: Superior angle of scapula
- Action: Elevation of scapula
- Innervation: Dorsal scapular nerve
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Rhomboids
- Origin: Upper thoracic vertebrae
- Insertion: Medial border of scapula
- Action: Elevation & retraction (adduction) of scapula
- Innervation: Dorsal scapular nerve
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