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The anterior thoracic nerve from the C5 to C8 roots innervates the pectoralis major and minor, and the thoracodorsal nerve from C6 to C8 roots innervates the latissimus dorsi muscle. The axillary nerve is formed by fibers of the C5 to C6 roots which go through the posterior cord of the plexus and innervate the deltoid and teres minor muscles, as well as part of the skin of the lateral shoulder.
The three meet and join to the olecranon of the ulna. When this muscle contracts, it pulls the olecranon in the direction of the shoulder-thus extending the forearm at the elbow joint. The triceps brachii muscle is innervated by the radial nerve, originating from spinal levels C6 and C8, but primarily C7.plit and merge into it. Answer by Qu.mstr. Confidence votes 360. The triceps brachii muscle is the primary extensor of the elbow, also known as the olecranon. To clarify, it is the elbow that can also be known as the olecranon.