**Actions: Act together to flex the shoulder joint
**Actions: Act together to flex the shoulder joint
**Innervation: Axillary nerve of the brachial plexus
**Innervation: Axillary nerve of the brachial plexus
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*There are no defined extensors of the shoulder. Those involved (brachiocephalic m., biceps brachii, supraspinatus, and ascending pectorals) have other, more primary roles.