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Infraspinatus
0%
0/95
Subscapularis
4%
4/95
Supraspinatus
20%
19/95
Teres major
7%
7/95
Teres minor
51%
48/95
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This young athlete with limited shoulder mobility has injured his teres minor muscle, which is the only muscle among the 4 rotator cuff muscles that is innervated by the axillary nerve. The axillary nerve (C5-C6) innervates the teres minor and the deltoid muscles. The shoulder muscles that form the rotator cuff are the following: 1. Supraspinatus muscle - innervated by the suprascapular nerve and functions to abduct the arm from 0 to 15 degrees 2. Infraspinatus muscle - innervated by the suprascapular nerve and functions to externally rotate the arm 3. Subscapularis muscle - innervated by the upper and lower subscapular nerve and functions to internally rotate and adduct the arm 4. Teres minor muscle - innervated by the axillary nerve and functions to adduct and externally rotate the arm Incorrect Answers: Answer 1: The infraspinatus muscle is innervated by the suprascapular nerve (C5-C6). Answer 2: The subscapularis muscle is innervated by the upper and lower subscapular nerves (C5-C6). Answer 3: The supraspinatus muscle is innervated by the suprascapular nerve (C5-C6). Answer 4: The teres major muscle, which is not 1 of the 4 muscles of the rotator cuff, is innervated by the lower subscapular nerve (C5-C8) and the thoracodorsal nerve (C5-C7). The teres major muscle functions to adduct and medially rotate the arm. Bullet Summary: The teres minor is innervated by the axillary nerve.
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