Fig. 26. Subscapular nerve anatomy. 1 Upper trunk. 2 Posterior cord. 3 Subscapular nerve. 4 Subscapular muscle. 5 Teres major muscle
Nerve fibers arise from C5 and C6, and travel through the upper trunk and Anatomy posterior cord of the brachial plexus. The nerve innervates the subscapularis and teres major muscle, to secure the shoulder joint and provide inward rotation of the shoulder (Fig. 26).
Compensation for the function of both muscles is provided by the pectoralis Symptoms major, latissimus dorsi, and anterior deltoid muscle.
Upon securing shoulder joint, an outward rotation of the upper arm. Signs
Atrophy is not visible, and there are no sensory findings.
Involvement either in association with radiculopathies or with posterior cord Pathogenesis brachial plexus injury. There are no entrapment lesions.
EMG of the teres major muscle Diagnosis
C5/C6 radiculopathy, posterior cord lesion of the brachial plexus Differential diagnosis
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