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Electrodiagnostics > Median and Ulnar Nerve > Flashcards

Median and Ulnar Nerve Flashcards

1
Q

ulnar nerve runs through what structure in the upper arm

A

arcade of struthers

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2
Q

what 2 muscles in the forearm is innervated by ulnar nerve

A

Flexor carpi ulnaris and flexor digitorum profundus

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3
Q

What 4 muscles does the median nerve innervate in the hand

A

Lumbricals 1 and 2
Opponens pollicis
Abductor pollicis brevis
Flexor pollicis brevis (superficial head)

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4
Q

Clinical presentation of ligament of struthers compression syndrome

A

Median nerve muscles affected, grip strength and wrist flexion weakness, benediction sign

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5
Q

what is affected in arcade of struthers injury

A

all ulnar innervated muscles

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6
Q

A positive froment’s sign indicates weakness in what muscle

A

Adductor pollicis

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7
Q

Median nerve runs ______ to the _______ and runs under the _______ of ________ at the _______ epicondyle of the humerus

A

Medial
Axillary artery
Ligament of struthers
Medial epicondyle

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8
Q

muscles involved in cubital tunnel syndrome

A

all muscles except flexor carpi ulnaris

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9
Q

froment’s sign

A

unable to adduct thumb and hold paper between thumb and forefinger indicating ulnar nerve injury

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10
Q

Clinical sign indicating AIN syndrome

A

Abnormal OK sign and difficulty forming a fist.

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11
Q

hypothenar muscles innervated by ulnar nerve

A

abductor digiti minimi, opponens digiti minimi, flexor digiti minimi

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12
Q

wartenberg’s sign

A

inability to adduct the pinky due to ulnar nerve injury

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13
Q

The anterior interosseous nerve branches from what nerve

A

Median nerve

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14
Q

nerve root origin of ulnar nerve

A

C8-T1

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15
Q

what nerve is spared in guyon’s canal injury

A

dorsal ulnar cutaneous nerve

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16
Q

What muscles become weak in CTS

A 
LOAF muscles
Lumbricals 1 and 2
Opponens pollicis
Abductor pollicis brevis
Flexor pollicis brevis (superficial head)
17
Q

muscles innervated by deep motor branch of ulnar nerve

A

palmaris brevis, dorsal interossei, lumbricals 3 and 4, adductor pollicis, deep head of flexor pollicis brevis

18
Q

What are the 9 tendons in the carpal tunnel

A

Four flexor digitorum superficialis tendons
Four flexor digitorum profundus tendons
One flexor pollicis longus tendon

19
Q

What is the ligament of struthers

A

Ligament that occurs in 1% of patients that connect medial epicondyle to a bone spur 3-6cm proximal

20
Q

Borders of the carpal tunnel

A

Transverse carpal ligament and the carpal bones

21
Q

What 4 muscles does median nerve innervate in forearm

A

Palmaris longus
Pronator teres
Flexor carpi radialis
Flexor digitorum superficialis

22
Q

The first muscle affected in AIN syndrome

A

Flexor pollicis longus

23
Q

What nerve is compressed in bicipital aponeurosis thickening

A

Median nerve

24
Q

what branch of the ulnar nerve does not go through guyon’s canal?

A

dorsal ulnar cutaneous nerve

25
Q

Most common nerve entrapment of upper extremity

A

CTS

26
Q

Muscles involved in AIN syndrome

A

Pronator quadratus, flexor pollicis longus, flexor digitorum profundus (1 and 2)

27
Q

martin-gruber vs riche-cannieu

A

martin-gruber is median AIN to ulnar nerve. Riche-cannieu is recurrent branch of median nerve in hand to deep motor branch of the ulnar nerve resulting in an all ulnar innervated hand.

28
Q

What muscles and nerves are affected in pronator teres syndrome

A

Median nerve compression at heads of pronator teres affecting all median nerve innervated muscles except pronator teres

29
Q

How many tendons and nerves are in the carpal tunnel

A

9 tendons and 1 nerve

30
Q

mild vs moderate vs severe cts

A 
mild = numbness worse during sleep.
moderate = continuous numbness with decreased grip strength.
severe = muscular atrophy and sensory loss
31
Q

mild vs moderate vs severe cts on edx studies

A 
mild = abnormal SNAP
moderate = abnormal CMAP
Severe = abnormal EMG
32
Q

in martin gruber anastamosis, what muscles does median nerve innervate

A

adductor pollicis, abductor digiti minimi, dorsal interossei

33
Q

What 4 muscles does the anterior interosseous nerve innervate

A

Flexor pollicis longus
Pronator quadratus
Flexor digitorum profundus for fingers 1 and 2.
It is a pure motor nerve

34
Q

Median nerve comes from what nerve roots

A

C5-T1

35
Q

what is tardy ulnar nerve palsy due to?

A

distal humerus fracture

Electrodiagnostics (20 decks)

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