Shoulder Extension

Deltoid
Posted On November 18 2018. Updated On November 18 2018.
The deltoid muscle is a major flexor of the shoulder joint, the muscle is innervated by axillary nerve from the the C4-C5.
Teres Major
Posted On November 18 2018. Updated On November 18 2018.
The teres major muscle is a muscle of the upper limb and one of six scapulohumeral muscles. It is a thick but somewhat flattened muscle, innervated by the lower subscapular nerve (c5,c6).