A newborn has weakness of shoulder abduction and elbow flexion with the arm held adducted and internally rotat…

Question

A newborn has weakness of shoulder abduction and elbow flexion with the arm held adducted and internally rotated, but hand function is intact. This pattern MOST suggests injury to:

Accepted Answer

보기 1: The upper trunk of the brachial plexus

상부 신경간 손상은 C5–C6 지배의 어깨·주관절 굴곡근을 침범하고 손 기능은 보존된다. 하부 신경간 손상은 반대로 손 내재근 위약이 주가 된다.

Answer

보기 2: The lower trunk of the brachial plexus producing intrinsic hand weakness

Answer

보기 3: The entire brachial plexus producing a completely flail upper limb

Answer

보기 4: The radial nerve alone producing an isolated wrist drop deformity

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A newborn has weakness of shoulder abduction and elbow flexion with the arm held adducted and internally rotated, but hand function is intact. This pattern MOST suggests injury to:

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