Skin Innervation of the Peripheral Nerves of the Upper Extremity

Question 1

3 Trunks of the Brachial Plexus

Answer 1

Superior = C5-C6
Middle = C7
Inferior = C8-T1

Question 2

The Lateral Cord consists of….

Answer 2

anterior divisions of superior and middle trunks

Question 3

The Posterior Cord consists of….

Answer 3

posterior divisions of all 3 trunks

Question 4

The Medial Cord consists of……

Answer 4

anterior division of inferior trunk

Question 5

Dermatome of the Superior aspect of the Shoulder

Answer 5

C4

Question 6

Dermatome of the Lateral Shoulder

Answer 6

C6

Question 7

Dermatome of the 3rd Digit

Answer 7

C7

Question 8

Dermatome of the 5th Digit

Answer 8

C8

Question 9

Dermatome of the medial aspect of the arm

Answer 9

T1

Question 10

Dermatome of the Axilla

Answer 10

T2

Question 11

Sensory ONLY nerves

Answer 11

-Medial brachial cutaneous
-Medial antebrachial cutaneous

Don’t cause motor

Question 12

Combined sensory-motor

Answer 12

Axillary
Radial
Musculocutaneous
Median
Ulnar

Question 13

Anterior and Posterior Dermatomes

Answer 13

Question 14

Peripheral Nerves and Sensory Regions

Answer 14

Question 15

Push’eR

Answer 15

-RADIAL n.
-Elbow extension against resistance (triceps contraction)

Question 16

Pull’eM

Answer 16

-Musculocutaneous n.
-Elbow flexion against resistance (biceps contraction)

Question 17

Pinch Me

Answer 17

Median n.
Pinch Index finger (2nd digit)

Question 18

Pinch U

Answer 18

Ulnar n.
Pinch pinky finger (5th digit)