Interactive NEET PG practice • Last reviewed: 19 September 2026
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MCQ 1
A lesion of the posterior cord most directly threatens which pair of terminal branches?
The posterior cord is formed by posterior divisions of all three trunks and terminates mainly as axillary and radial nerves. A lesion therefore threatens deltoid/teres minor function plus the extensor compartments. Median and ulnar nerves arise from medial/lateral cord contributions; suprascapular and long thoracic nerves arise proximal to the cords.
MCQ 2
Winged scapula after axillary surgery most strongly suggests injury to a nerve arising mainly from:
The long thoracic nerve arises directly from C5, C6 and C7 roots and supplies serratus anterior. Injury produces medial winging, accentuated by pushing against a wall, and difficulty elevating the arm above horizontal. It does not arise from the posterior cord.
MCQ 3
Erb-pattern weakness classically follows predominant injury to:
Erb palsy is an upper-trunk C5–C6 pattern. Weak shoulder abduction/lateral rotation and elbow flexion/supination produce the “waiter’s tip” posture. C8–T1 involvement instead causes a lower-trunk/Klumpke pattern with prominent intrinsic hand weakness.
MCQ 4
Which nerve pierces coracobrachialis?
It arises from the lateral cord, pierces coracobrachialis, then runs between biceps and brachialis. It supplies the anterior arm compartment and continues as the lateral cutaneous nerve of the forearm.
MCQ 5
The cords of the brachial plexus are named according to their relationship with the:
Lateral, medial and posterior cords are named by their position around the second part of the axillary artery, which lies behind pectoralis minor. Remember: “cords surround the second part.”
Review the complete Brachial Plexus visual module.
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Featured image: CHUTTERSNAP via Unsplash.
Last reviewed: 19 September 2026
Medical disclaimer: This article is for professional education and news interpretation only. It does not replace patient-specific assessment, local protocols, prescribing information or specialist advice.