[36] Other Nerve Injuries Flashcards

1
Q

What are the nerve roots of the radial nerve?

A

C5-T1

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2
Q

What do low lesions of the radial nerve affect?

A

Posterior interosseous nerve

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3
Q

What causes low lesions of the radial nerve?

A

Fracture around the elbow or forearm, e.g. fracture of the head of the radius

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4
Q

What does a lesion of the posterior interosseous nerve produce?

A

Loss of extension of the CMC joints, producing finger drop

No sensory loss

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5
Q

What can cause high lesions of the radial nerve?

A

Fracture of shaft of the humerus where the nerve is in the radial groove

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6
Q

What results from high lesions of the radial nerve?

A

Wrist drop

Loss of sensation to dorsum of the thumb root (snuff box)

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7
Q

What can cause very high lesions of the radial nerve?

A

Compression in axilla, e.g. crutches

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8
Q

What results from a very high lesion of the radial nerve?

A

Paralysis of the triceps and wrist drop

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9
Q

What are the roots of the ulnar nerve?

A

C8-T1

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10
Q

Where can the ulnar nerve get injured in the elbow?

A

Cubital tunnel

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11
Q

Where can the ulnar nerve get injured in the wrist?

A

Guyon’s canal

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12
Q

What are the effects of ulnar nerve palsy?

A

Intrinsic hand muscle paralysis, leading to claw hand
Weakness of finger ad/abduction
Sensory loss over little finger

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13
Q

What is the ulnar paradox?

A

A lesion at the elbow has less clawing, as FDP is paralysis which decreases flexion of 4th and 5th digits

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14
Q

How can the ulnar nerve be tested?

A

Cross fingers

Look for Froment’s sign?

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15
Q

What is Froment’s sign?

A

Flexion of the thumb IPJ when trying to hold onto paper held between the thumb and finger

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16
Q

What does Froment’s sign indicate?

A

Weak adductor policis

17
Q

What are the nerve roots for the median nerve?

A

C5-T1

18
Q

What is produced when there is an injury to the median nerve above the antecubital fossa?

A

Can’t flex the index finger IPJs
Can’t flex terminal thumb phalanx
Loss of sensation in median distribution

19
Q

What is affected when there is an injury to the median nerve at the wrist?

A

Typically affects the abductor pollicis brevis

20
Q

When else might the median nerve get injured?

A

Carpal tunnel syndrome