Brachial Plexus Injury Quiz

Which trunk injury results in the loss of biceps and shoulder muscles function?

• Upper

• Middle

• Lower

• None

What happens to myelin during Wallerian degeneration?

• It is transformed into neutral fat and phagocytosed by macrophages

• It remains intact

• It regenerates immediately

• It forms new axons

What provides the pathway and scaffolding for axonal regeneration in the distal stump?

• Endoneurial tubes lined by Schwann cells

• Myelin sheath

• Axonal debris

• Cell body

What is the primary difference between the central nervous system (CNS) and the peripheral nervous system (PNS) in terms of injury response?

• CNS repairs itself, while PNS does not.

• PNS repairs itself, while CNS does not.

• Both CNS and PNS repair themselves.

• Neither CNS nor PNS repair themselves.

Which of the following is NOT a mechanism through which nerve repair can occur?

• Remyelination

• Collateral sprouting

• Regeneration from the site of injury

• Neuronal apoptosis

What is the most critical factor affecting nerve regeneration?

• The length of the gap between the proximal and distal stumps

• The formation of growth cones

• The activation of neurotrophic factors

• The local accumulation of actin filaments

How does regeneration after surgical repair compare to spontaneous regeneration?

• It is faster

• It is slower

• It is the same

• It does not occur

What is not synonymous with the return of function in the context of brachial plexus injuries?

• Axon regeneration

• Muscle hypertrophy

• Tendon reflexes

• Sensory disturbances

What is a high level of suspicion required for in cases involving an injury of the shoulder girdle?

• Muscle hypertrophy

• Nerve injury

• Bone density loss

• Skin abrasions

What is a clinical sign of palsy of the long thoracic nerve?

• Enhanced external rotation

• Defect during scapular abduction

• Increased tendon reflexes

• Enhanced sensory perception