Upper Limb · NEET PG Preparation Anatomy
A 32-year-old male presents with a knife wound to the axilla. Examination reveals an inability to initiate abduction of the shoulder joint and loss o…
Practice question from Upper Limb (NEET PG Preparation Anatomy), with the correct answer and a step-by-step solution.
easy · MCQ · Q-668040
A 32-year-old male presents with a knife wound to the axilla. Examination reveals an inability to initiate abduction of the shoulder joint and loss of sensation over the lower half of the deltoid muscle (sergeant's patch). Which of the following cords of the brachial plexus and its terminal branch are most likely injured?
- A.Posterior cord, Axillary nerveCorrect answer
- B.Lateral cord, Musculocutaneous nerve
- C.Medial cord, Ulnar nerve
- D.Posterior cord, Radial nerve
Solution
The axillary nerve is a direct branch of the posterior cord of the brachial plexus (C5, C6). It innervates the deltoid and teres minor muscles and provides sensory supply via the superior lateral cutaneous nerve of the arm, overlying the lower deltoid (sergeant's patch). The deltoid is responsible for shoulder abduction from 15 to 90 degrees.
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