Injury to the upper brachial plexus results in:

Appeared in: UPPSC 2022

Explanation

Erb's palsy is the specific clinical condition resulting from damage to the upper nerve roots (C5 and C6) of the brachial plexus.
This type of injury is commonly associated with birth trauma, such as shoulder dystocia, where there is excessive lateral traction on the head and neck.
The hallmark sign is the 'waiter's tip' or 'policeman's tip' posture, where the arm hangs adducted and internally rotated, with the elbow extended and forearm pronated.
Paralysis affects muscles like the deltoid, biceps, and brachialis, leading to loss of abduction, external rotation, and forearm supination.

Option A: Klumpke's palsy results from an injury to the lower brachial plexus (nerve roots C8 and T1), not the upper plexus.
Option B: Phrenic nerve palsy involves the phrenic nerve (C3-C5), which innervates the diaphragm. Injury causes respiratory distress, not arm paralysis.
Option C: Facial palsy is due to an injury to the facial nerve (Cranial Nerve VII), which controls the muscles of the face. It is anatomically distinct from the brachial plexus.

Clinical Relevance

Nursing practice connection: Knowing Brachial Plexus Injuries and Associated Palsies helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses play a crucial role in the early detection of brachial plexus injuries in newborns by assessing for asymmetric arm movements, an absent Moro reflex on the affected side, and the characteristic 'waiter's tip' posture.
Patient and family education is a key nursing responsibility, focusing on gentle handling techniques, proper positioning to prevent contractures, and the importance of follow-up with physical therapy.
What if? If the injury involved a sudden upward pull on the arm (hyperabduction), such as grabbing a branch while falling, the injury would likely affect the lower brachial plexus (C8-T1), resulting in Klumpke's palsy with a 'claw hand' deformity.

How to Approach the Question

This is a factual recall question that tests your knowledge of neuro-anatomy and related clinical conditions.
First, identify the key anatomical location in the question stem: 'upper brachial plexus'.
Next, recall the two primary palsies associated with the brachial plexus: Erb's palsy and Klumpke's palsy.
Differentiate between them based on location: Erb's palsy affects the upper plexus (C5, C6), while Klumpke's palsy affects the lower plexus (C8, T1).
Match 'upper brachial plexus' with Erb's palsy.
Eliminate the other options by recognizing they involve different nerve structures (Phrenic nerve for the diaphragm, Facial nerve for the face).

Concept Tested & Keywords

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E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 1077-1079

E6 Anatomy BDChaurasia V1 10e p. 61-63

E6 Obstetrics Williams p. 19-36

Practise the full UPPSC 2022

Attempt every question from this paper in a timed mock, then review the full solution for each one.