Median and Ulnar Nerve

Question 1

ulnar nerve runs through what structure in the upper arm

Answer 1

arcade of struthers

Question 2

what 2 muscles in the forearm is innervated by ulnar nerve

Answer 2

Flexor carpi ulnaris and flexor digitorum profundus

Question 3

What 4 muscles does the median nerve innervate in the hand

Answer 3

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

Question 4

Clinical presentation of ligament of struthers compression syndrome

Answer 4

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

Question 5

what is affected in arcade of struthers injury

Answer 5

all ulnar innervated muscles

Question 6

A positive froment’s sign indicates weakness in what muscle

Answer 6

Adductor pollicis

Question 7

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

Answer 7

Medial
Axillary artery
Ligament of struthers
Medial epicondyle

Question 8

muscles involved in cubital tunnel syndrome

Answer 8

all muscles except flexor carpi ulnaris

Question 9

froment’s sign

Answer 9

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

Question 10

Clinical sign indicating AIN syndrome

Answer 10

Abnormal OK sign and difficulty forming a fist.

Question 11

hypothenar muscles innervated by ulnar nerve

Answer 11

abductor digiti minimi, opponens digiti minimi, flexor digiti minimi

Question 12

wartenberg’s sign

Answer 12

inability to adduct the pinky due to ulnar nerve injury

Question 13

The anterior interosseous nerve branches from what nerve

Answer 13

Median nerve

Question 14

nerve root origin of ulnar nerve

Answer 14

C8-T1

Question 15

what nerve is spared in guyon’s canal injury

Answer 15

dorsal ulnar cutaneous nerve

Question 16

What muscles become weak in CTS

Answer 16

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

Question 17

muscles innervated by deep motor branch of ulnar nerve

Answer 17

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

Question 18

What are the 9 tendons in the carpal tunnel

Answer 18

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

Question 19

What is the ligament of struthers

Answer 19

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

Question 20

Borders of the carpal tunnel

Answer 20

Transverse carpal ligament and the carpal bones

Question 21

What 4 muscles does median nerve innervate in forearm

Answer 21

Palmaris longus
Pronator teres
Flexor carpi radialis
Flexor digitorum superficialis

Question 22

The first muscle affected in AIN syndrome

Answer 22

Flexor pollicis longus

Question 23

What nerve is compressed in bicipital aponeurosis thickening

Answer 23

Median nerve

Question 24

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

Answer 24

dorsal ulnar cutaneous nerve

Question 25

Most common nerve entrapment of upper extremity

Answer 25

CTS

Question 26

Muscles involved in AIN syndrome

Answer 26

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

Question 27

martin-gruber vs riche-cannieu

Answer 27

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.

Question 28

What muscles and nerves are affected in pronator teres syndrome

Answer 28

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

Question 29

How many tendons and nerves are in the carpal tunnel

Answer 29

9 tendons and 1 nerve

Question 30

mild vs moderate vs severe cts

Answer 30

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

Question 31

mild vs moderate vs severe cts on edx studies

Answer 31

``` mild = abnormal SNAP moderate = abnormal CMAP Severe = abnormal EMG ```

Question 32

in martin gruber anastamosis, what muscles does median nerve innervate

Answer 32

adductor pollicis, abductor digiti minimi, dorsal interossei

Question 33

What 4 muscles does the anterior interosseous nerve innervate

Answer 33

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

Question 34

Median nerve comes from what nerve roots

Answer 34

C5-T1

Question 35

what is tardy ulnar nerve palsy due to?

Answer 35

distal humerus fracture