Upper Limb · NEET PG Preparation Anatomy
A 45-year-old painter presents with pain and weakness when trying to abduct his right arm. Upon clinical testing, he is unable to initiate abduction…
Practice question from Upper Limb (NEET PG Preparation Anatomy), with the correct answer and a step-by-step solution.
medium · MCQ · Q-841948
A 45-year-old painter presents with pain and weakness when trying to abduct his right arm. Upon clinical testing, he is unable to initiate abduction for the first 15 degrees, though he can maintain abduction beyond that point if the arm is passively raised. Which muscle and nerve are primarily responsible for the initial 15 degrees of abduction?
- A.Deltoid muscle, Axillary nerve
- B.Supraspinatus muscle, Suprascapular nerveCorrect answer
- C.Infraspinatus muscle, Suprascapular nerve
- D.Serratus anterior muscle, Long thoracic nerve
Solution
Abduction of the shoulder is initiated for the first 15 degrees by the supraspinatus muscle, which is supplied by the suprascapular nerve (C5, C6). The deltoid muscle takes over the movement from 15 to 90 degrees, and the trapezius and serratus anterior further elevate the arm above 90 degrees.
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