QuestionSBA
QuestionChoice
This is incorrect. The infant in this vignette shows signs of Erb's palsy, which is caused by C5-C6 nerve root damage. C8-T1 are the nerve roots affected in Klumpke's palsy not Erb's palsy. This predominantly affects the nerves of the T1 root, ulnar and medial and presents with a clawed hand appearance.
10025813
d
C8-T1
QuestionChoice
This is incorrect. The infant in this vignette shows signs of Erb's palsy, which is caused by C5-C6 nerve root damage. C3-C4 are unaffected by Erb's palsy, making this option incorrect. C3-C4 is also not part of the brachial plexus and therefore would not give rise to the clinical features described here.
10025811
b
C3-C4
QuestionChoice
This is incorrect. The infant in this vignette shows signs of Erb's palsy, which is caused by C5-C6 nerve root damage. By contrast, T2-T3 nerve roots are not part of the brachial plexus. Therefore any damage to these roots would not give rise to the clinical presentation seen in this case.
10025814
e
T2-T3
QuestionChoice
This is correct. The patient in the vignette demonstrates the waiter's tip sign which is characteristic of Erb's palsy. This involves damage to the nerve roots C5-C6. Being born via an instrumental vaginal delivery is a risk factor for Erb's palsy. Individuals with Erb's palsy also show dermatomal sensory loss in the C5-6 distribution.
10025810
a
C5-C6
QuestionChoice
This is incorrect. The infant in this vignette shows signs of Erb's palsy, which is caused by C5-C6 nerve root damage. C7-C8 are unaffected by Erb's palsy, making this option incorrect. C7-C8 damage would also not give rise to the clinical signs in the vignette as the waiter's tip sign is seen due to the musculocutaneous and axillary nerves being affected.
10025812
c
C7-C8
Concept
Chapter
2693
3864
Brachial plexus injuries
Topic
141
Neurology
17560
A newborn baby is examined by the on-call paediatrician following an instrumental vaginal delivery. The baby was born at 39 weeks gestation and weighs 7 pounds 3 ounces. On examination, the baby's right shoulder rests in adduction while the right elbow is fixed in extension. The right forearm is pronated and wrist is flexed.

Which of the following nerve roots have been damaged in this patient?
a