Neuropathy

Question 1

Axillary nerve (C5-6)

Answer 1

• Sensory: regimental badge area
• Motor: Deltoid
• Common MOI: surgical neck of humerus fracture
• Injury features: flattening of shoulder, unable to abduct shoulder

Question 2

Musculocutaneous nerve (C5-7)

Answer 2

• Sensory: lateral aspect of anterior forearm
• Motor: anterior compartment of upper arm
• Common MOI: stab wound to axilla
• Injury features: weak flexion of shoulder and elbow, weak supination

Question 3

Radial nerve (C5-8)

Answer 3

• Sensory: posterior forearm, lateral dorsal of hand and lateral dorsal 3.5 digits
• Motor: triceps, posterior compartment of forearm
• Common MOI: humeral/radial shaft fracture
• Injury features: wrist drop, weak elbow extension

Question 4

Median nerve (C6-T1)?

Answer 4

• Sensory: lateral aspect of pal and lateral palmar 3.5 digits
• Motor: Anterior compartment of forearm (except FCU (ulnar nerve)), thenar muscles, LOAF mucles
• Common MOI: supracondylar fracture, carpal tuner syndrome, damage to wrist proximal to carpal tunnel
• Injury features: Thenar rating, hand of benediction when making fist, weak wrist flexion with ulnar deviation

Question 5

Ulnar nerve (C8 and T1)?

Answer 5

• Sensory: medial aspect of palm and medial 1.5 digits
• Motor: FCU and muscles of hand (except LOAF muscles)
• Common MOI: vulnerable to elbow trauma and cubital compression
• Injury features: wasting of hypothenar eminence, positive froment’s sign, unable to grip a piece of paper, claw hand, weak finger abduction and adduction.

Question 6

Common peroneal nerve injury (L4-S2)?

Answer 6

• Sensory: skin of lateral leg and dorsal of foot
• Motor: lateral and anterior compartment of leg, short head biceps femoris
• Common MOI: fibula fracture, trauma to knee
• Injury features: foot drop, version flick, loss of lateral leg and dorsal of foot sensation

Question 7

Tibial nerve (S1-S3)?

Answer 7

• Sensory: posterolateral leg, lateral foot, sole of foot
• Motor: poster compartment of leg and intrinsic foot muscles
• Common MOI: trauma or entrapment through narrow space
• Injury features: loss of plantarflexion, weakened inversion, very rare injury