Conference 6: Wrist, Hand, and Upper Limb Innervation

Question 1

1

Answer 1

Hypothenar eminance

Question 2

2

(Carpal bones)

Answer 2

Pisiform

Question 3

3

(Tendon)

Answer 3

Flexor carpi ulnaris

Question 4

4

(2 structures that run together)

Answer 4

Ulnar artery and nerve

Question 5

5

(Tendon)

Answer 5

Tendon of the palmaris longus

Question 6

6

Answer 6

Thenar eminance

Question 7

7

(Nerve would be here)

Answer 7

Median nerve

Question 8

8

(Artery that would be here - important pulse point)

Answer 8

Radial artery

Question 9

9

(Tendon)

Answer 9

Flexor carpi radialis

Question 10

What would be the sensory deficits resulting from an destructive ulnar nerve lesion at the wrist?

Answer 10

Hypethesia (diminished sensation) over the palmar surface of the ulnar 1.5 digits

Question 11

Why would a sensory nerve lesion to the ulnar nerve at the wrist ONLY result in hypethesia, and not complete loss of sensation?

Answer 11

There is overlap in areas supplied by the:

1. intact median nerve (radial half of palmar suraface of ring finger and remainder of palm)
2. intact dorsal branch of the ulnar nerve (dorsum of hand, little finger and half of ring finger)

Question 12

What would be the dynamic motor deficits resulting from a ulnar nerve lesion at the wrist?

Answer 12

1. loss of abduction and adduction of the fingers (because the interosseous muscles are innervated by the ulnar nerve)
2. loss of thumb adduction (adductor pollicus)
3. loss of simultaneous flexion of MP joints and extension of IP joints of the ulnar two digits (all interossei and ulnar two lumbricals)
4. weakness in simultaneous flexion of MP joint and extension of IP joint in the index and middle finger (two most radial lumbricals)

Question 13

1

Answer 13

Skin and superficial fascia

Question 14

2

Answer 14

Palmar aponeurosis

Question 15

3

Answer 15

Branches of superificial palmar arch and ulnar and median nerves

Question 16

4

Answer 16

Tendons of:

FDS (top)

FDP (bottom)

Question 17

5

Answer 17

Lumbricals

Question 18

6

Answer 18

Branches of deep palmar arch and deep ulnar nerve

Question 19

7

Answer 19

Adductor pollicus

Question 20

8

Answer 20

Interossei

Question 21

9

Answer 21

Metacarpal bones

Question 22

Anesthesia

Answer 22

numbness

Question 23

Hypethesia

Answer 23

Diminished sensation

Question 24

Opponens Pollicus

1. Function
2. Nerve
3. Spinal nerve segment

Answer 24

1. Thumb opposition
2. Recurrent branch of median nerve
3. C8 and (T1)

Question 25

Interossei

1. Function
2. Nerve
3. Spinal nerve segment

Answer 25

1. finger aduction-abduction
2. ulnar nerve (C8) and T1

Question 26

Adductor Pollicus

1. Function
2. Nerve
3. Spinal nerve segment

Answer 26

1. adduct thumb
2. ulnar nerve
3. C8, T1

Question 27

Lumbricals and interossei

1. Function
2. Nerve
3. Spinal nerve segment

Answer 27

1. simultaneous MP flexion and IP extension
2. median and ulnar nerves
3. C8, T1

Question 28

FDS and FDP

1. Function
2. Nerve
3. Spinal nerve segment

Answer 28

1. finger flexion
2. FDS and radial 1/2 of FDP - median nerve, ulnar half of FDP is ulnar nerve
3. C8 and (T1)

Question 29

Medial antebrachial cutaneous nerve

Answer 29

Skin over medial border of wrist and forearm

Question 30

Medial brachial cutaneous nerve

Answer 30

Skin over lower medial arm

Question 31

Skin over little finger

Answer 31

Ulnar nerve