Mehlman Upper limb n. surg: Ulnar, radial, mucocutan

Question 1

Ulnar. innervation of what?

Answer 1

Medial ,,1 and a half” fingers, medial forearm.

Question 2

Medial ,,1 and a half” fingers, medial forearm.?

Answer 2

Ulnar

Question 3

Ulnar. what movements?

Answer 3

Finger abduction and adduction (ie interosseous muscles).

Question 4

Ulnar. thumb …?

Answer 4

adduction

in contrast, median nerve thumb abduction

Question 5

Ulnar. What sign usmle loves for injury?

Answer 5

Froment sign

Question 6

Ulnar. Froment sign?

Answer 6

inability to pinch a piece of paper between the thumb and index finger (ulnar nerve needed for thumb adduction against index finger, despite being the most lateral digit).

Question 7

Ulnar. inability to pinch a piece of paper between the thumb and index finger?

Answer 7

Froment sign

Question 8

Ulnar. Guyon canal syndrome. definition?

Answer 8

DISTAL compression (ie of wrist and hand only, not forearm)/ aka Ulnar nerve entrapment at the wrist.

Question 9

Ulnar. Guyon canal syndrome. caused by?

Answer 9

Caused by hook of hamate fracture
OR
chronic handlebar compression in avid cyclists.

Question 10

Ulnar. Guyon canal syndrome. CP?

Answer 10

paresthesias/numbness of 4th and 5th fingers + hypothenar eminence.

Question 11

paresthesias/numbness of 4th and 5th fingers + hypothenar eminence.?

Answer 11

Ulnar. Guyon canal syndrome.

Question 12

Ulnar. Cubital tunnel syndrome?underrated diagnose

Answer 12

PROXIMAL compression (ie medial forearm + wrist/hand)/proximal entrapment at the medial elbow

Question 13

Ulnar. Cubital tunnel syndrome, CP?

Answer 13

Produces paresthesias in along the ulnar distribution of the medial forearm, hypothenar eminence, and medial 1.5 fingers

Question 14

Ulnar. Cubital tunnel syndrome. sounds like what?

Answer 14

like carpal tunnel, but ,,on the ulnar side instead” –> tx cubital

Question 15

Ulnar. Cubital tunnel syndrome. Tx?

Answer 15

overnight ELBOW splint / straight-arm cast to be worn while sleeping (this is HY for the USMLE).

surgery always wrong

Question 16

Ulnar. Cubital tunnel syndrome. surgery always wrong

Answer 16

.

Question 17

Ulnar. Cubital tunnel syndrome. what situations provoke?

Answer 17

classically caused by sleeping with the hands behind the head with the arms bent; can also be caused by bench pressing.

Question 18

Ulnar. entrapment at the wrist?

Answer 18

Distal. Guyon canal

Question 19

Ulnar. entrapment at the medial elbow?

Answer 19

proximal. Cubital tunnel

Question 20

Radial. innervation af what?

Answer 20

fingers, wrist, elbow extension.

Question 21

Radial. innvercation abbrev?

Answer 21

BEST -> brachioradialis; extensors; supinator; triceps

Question 22

Radial. palsy due to fracture?

Answer 22

midshaft fracture of the humerus OR
fracture at the radial groove.

Question 23

midshaft fracture of the humerus OR
fracture at the radial groove.?

Answer 23

Radial. palsy.

Question 24

BEST -> brachioradialis; extensors; supinator; triceps?

Answer 24

Radial.

Question 25

Radial. retired nbme Q: construction worker sustains comminuted spiral fracture of humerus (unusual, since spiral = child abuse) –~> they ask for resulting defect -> Loss of radial nerve function

Answer 25

.

Question 26

Radial. HY injury results in …?

Answer 26

results in pronated forearm + wrist drop.

Question 27

results in pronated forearm + wrist drop.?

Answer 27

Radial. HY injury results in..

Question 28

Musculocutaneous. innervates what?

Answer 28

main innervation of biceps

Question 29

main innervation of biceps?

Answer 29

Musculocutaneous.

Question 30

Musculocutaneous. injury results in ……

Answer 30

injury results in loss of sensation over lateral forearm + decreased biceps function.

usmle doesnt give a fuck about what kind of injury causes palsy.

Question 31

injury results in loss of sensation over lateral forearm + decreased biceps function?

Answer 31

Musculocutaneous.