Action: Shoulder abduction, flexion and extensionOrigin - Lateral border of the acromion process of the scapulaInsertion - The deltoid tuberosity on the lateral surface of the proximal humeral shaft.Innervation - Axillary nerve (C5, C6)

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1.
Action: Shoulder abduction, flexion and extension
Origin - Lateral border of the acromion process of the scapula
Insertion - The deltoid tuberosity on the lateral surface of the proximal humeral shaft.
Innervation - Axillary nerve (C5, C6)