Scan Exam

Question 1

Dermatome C5

Answer 1

Area of the deltoid muscle and lateral upper arm.

Question 2

Dermatome C6

Answer 2

Lateral forearm.
Radial side of the hand.
Thumb and index finger.

Question 3

Dermatome C7

Answer 3

Posterior Forearm.

3rd and 4th digits.

Question 4

Dermatome C8

Answer 4

Medial forearm.
Ulnar border or the hand.
4th and 5th digits.

Question 5

Dermatome T1

Answer 5

Medial forearm and upper arm

Question 6

Dermatome T2

Answer 6

Medial upper arm.

Question 7

Peripheral Strength vs. Myotomal Testing

Answer 7

Because these nerves are in the forearm we can test them. Ex. Wrist flexion is weak thus raising suspicion for ulnar nerve involvement rather than a myotome.

Radial nerve
- Extensor muscle of the forearm

Ulnar Nerve
- Flexor carpi ulnaris and the ulnar portion of the flexor digitorum profundus along with most of the intrinsic muscle of the hand.

Median Nerve
Flexor muscles of the wrist and hand.

Question 8

Myotomal C5

Answer 8

Shoulder Abduction

Question 9

Myotomal C6

Answer 9

Elbow Flexion with wrist extension.

Question 10

Myotomal C7

Answer 10

Elbow Extension with wrist flexion

Question 11

Myotomal C8

Answer 11

Finger Flexion
Thumb Extension
Ulnar Deviation

Question 12

Myotomal T1

Answer 12

Finger Abduction/Hand Intrinsics

Question 13

Myotomal C4

Answer 13

Shoulder Elevation

Question 14

Myotomal C3

Answer 14

Lateral Neck Flexion

Question 15

Myotomal C1-C2

Answer 15

Neck Flexion

Question 16

Peripheral Nerve Cutaneous Distribution: Radial Nerve

Answer 16

Lateral elbow to posterior middle forearm to 1st and proximal half of the 2nd digit

Question 17

Peripheral Nerve Cutaneous Distribution: Median Nerve

Answer 17

1st, 2nd and 3rd digits

Question 18

Peripheral Nerve Cutaneous Distribution: Ulnar Nerve

Answer 18

5th digit and half of 4th digit on 5th digit side.

Question 19

Peripheral Nerve Cutaneous Distribution: Musculocutaneous Nerve

Answer 19

Lateral Forearm