Shoulder Anatomy
A 55-year-old man presents with anterior shoulder pain and weakness after a fall onto his outstretched arm. Examination reveals increased passive external rotation compared to the opposite side. He is unable to lift his hand off his back (positive lift-off test) and has weakness with internal rotation against resistance (positive belly-press test). MRI confirms a subscapularis tear. Regarding subscapularis anatomy:
Mark each as TRUE or FALSE
The subscapularis is the largest and strongest of the rotator cuff muscles (53% of total cuff mass);...
The subscapularis is innervated by the upper and lower subscapular nerves (C5, C6) from the posterio...
The entire subscapularis insertion is tendinous; isolated subscapularis tears are the most common ro...
The upper 60% of the subscapularis insertion is tendinous while the lower 40% is muscular (inserting...
Subscapularis tears are often associated with biceps pulley lesions and biceps instability; increase...
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Click T (True) or F (False) for each option