Sensory and Motor Functions of Peripheral Nerves and Dermatomes

Question 1

Describe the sensory region of dermatome C4

Answer 1

superior aspect of shoulder

Question 2

Describe the sensory region of dermatome C6

Answer 2

lateral shoulder

Question 3

Describe the sensory region of dermatome C7

Answer 3

3rd digit

Question 4

Describe the sensory region of dermatome C8

Answer 4

5th digit

Question 5

Describe the sensory region of dermatome T1

Answer 5

medial aspect of the arm

Question 6

Describe the sensory region of dermatome T2

Answer 6

axilla

Question 7

describe the sensory region of the axillary nerve

Answer 7

lateral upper arm at shoulder

Question 8

describe the sensory region of the intercostobrachial and medial brachial cutaneous nerves

Answer 8

medial upper arm to elbow

Question 9

describe the sensory region of the medial ante brachial cutaneous nerve

Answer 9

anterior upper arm, anterior and medial forearm to wrist

Question 10

describe the sensory region of the musculocutaneous/lateral ante brachial cutaneous nerve

Answer 10

lateral forearm to the wrist

Question 11

describe the sensory region of the radial nerve

Answer 11

lateral upper arm
posterior arm below shoulder
posterior forearm
dorm of the hand lateral to the axial line of the 4th digit
radial side of the thumnb

Question 12

describe the sensory region of the median nerve

Answer 12

palmar side of the 1st, 2nd, 3rd digits (palmar side and tips on dorsal side)
radial side of 4th digit (palmar side and tip on dorsal side)

Question 13

describe the sensory region of the ulnar nerve

Answer 13

hypothenar eminence
ulnar side of 4th digit and entire 5th digit

Question 14

describe the motor function of the axillary nerve

Answer 14

shoulder abduction (deltoid contraction)

Question 15

describe the motor function of the intercostobrachial and medial brachial cutaneous nerves

Answer 15

no motor function

Question 16

describe the motor function of the medial antebrachial cutaneous nerve

Answer 16

no motor function

Question 17

describe the motor function of the MSK nerve

Answer 17

elbox flexion (biceps contraction)
forearm supination (palm faces upwards)

Question 18

describe the motor function of the lateral ante brachial cutaneous nerve

Answer 18

extension of MSK nerve below elbow and does not have motor function

Question 19

describe the motor function of the radial nerve

Answer 19

elbow extension (biceps contraction)
wrist extension
finger extension
thumb abduction

Question 20

describe the motor function of the median nerve

Answer 20

forearm pronation (palm faces downwards)
finger flexion (first 3.5 digits)
thumb opposition (brings thumb to contact a finger)

Question 21

describe the motor function of the ulnar nerve

Answer 21

wrist flexion
ulnar deviation
5th digit opposition (brings 5th digit to contact the thumb)
finger flexion (4th and 5th digits)
thumb adduction (adductor pollicis contraction- think NMB’s)

Question 22

4 P’s: pusheR

Answer 22

elbow extension against resistance (triceps contraction –> radial nerve)

Question 23

4 P’s: pull’eM

Answer 23

elbow flexion against resistance (biceps contraction) MSK n

Question 24

4 P’s: pinch Me

Answer 24

pinch index finger (2nd digit) median n

Question 25

4P’s: Punch U

Answer 25

pinch pinky finger (5th digit) ulnar n