13) Your patient dislocated their glenohumeral joint. They n…

13) Your patient dislocated their glenohumeral joint. They now have total paralysis of the deltoidmuscle but weak abduction movement of the arm is still possible. External rotation of thearm is slightly weakened. Elbow flexion and extension strength are normal. Numbness existsat skin over lateral aspect of upper arm. Sensation elsewhere is normal. Where is the lesion?