Nerves, Muscles, and Tests for the Arm

Question 1

Cutaneous innervation of the Axillary nerve

Answer 1

C5, C6

-Lateral aspect of the shoulder and upper arm

Question 2

Cutaneous innervation of the Musculocutaneus nerve

Answer 2

C5, C6, C7

-Lateral forearm

Question 3

Cutaneous innervation of the Radial nerve

Answer 3

C5, C6, C7, C8, T1

-Posterior compartments of the arm and forearm. Lateral arm

Question 4

Cutaneous innervation of the Ulnar nerve

Answer 4

C8, T1

-Medial part of the 4th and all of the 5th digit down to the medial wrist

Question 5

Cutaneous innervation of the Median nerve

Answer 5

C6, C7, C8, T1

-Lateral palm and digits 1, 2, 3 and lateral 1/2 of 4.

Question 6

Biceps Reflex segmental innervation

Answer 6

C5

Question 7

Brachioradialis Reflex segmental innervation

Answer 7

C6

Question 8

Triceps Reflex segmental innervation

Answer 8

C7

Question 9

Finger Flexion Reflex segmental innervation

Answer 9

C8

Question 10

C5 Myotomes

Answer 10

Supraspinatus, Deltoid, Biceps, Brachioradialis

Question 11

C6 Myotomes

Answer 11

Wrist extenders, biceps, brachioradialis

Question 12

C7 Myotomes

Answer 12

Triceps, Wrist flexion, finger extension

Question 13

C8 Myotomes

Answer 13

Finger flexion

Question 14

Objectify of the sensory testing protocol

Answer 14

Introduce light and sharp touch to the patient

Question 15

Sensory testing protocol

Answer 15

• Patient closes eyes. Mix in light and sharp touch, patient identifies location and sharp or light touch after each touch
• Touch with light on right side and compare with left then use sharp in the same manner

Question 16

T/F When conducting a sensory test, travel through each dermatome and peripheral nerve distribution

Answer 16

True

Question 17

Last component of the sensory testing protocol

Answer 17

Test vibration sensation at the wrist, elbow, and shoulder

Question 18

Motor C5

Answer 18

• Supraspinatus
• Brachioradialis
• Deltoid
• Biceps

Question 19

Sensory C5

Answer 19

Lateral aspect of the upper arms

Question 20

Reflex C5

Answer 20

Biceps Reflex

Question 21

Motor Axillary nerve

Answer 21

(C5, C6)

• Deltoid
• Teres Minor

Question 22

Sensory Axillary nerve

Answer 22

(C5, C6)

Skin covering the inferior part of the deltoid muscle

Question 23

Motor C6

Answer 23

Wrist extension muscles

Question 24

Sensory C6

Answer 24

Tip of the thumb and lateral forearm

Question 25

Reflex C6

Answer 25

Brachioradialis

Question 26

Motor Musculocutaneous nerve

Answer 26

(C5, C6, C7)

-All muscles in the anterior compartment of the arm (coracobrachialis, biceps, brachiallis)

Question 27

Sensory Musculocutaneous nerve

Answer 27

(C5, C6, C7)

-Skin on the lateral side of the forearm

Question 28

Reflex for Musculocutaneous

Answer 28

Biceps reflex

Question 29

Motor C7

Answer 29

• Triceps
• Wrist flexion muscles
• Finger extension muscles

Question 30

Sensory C7

Answer 30

Tip of the middle finger and median part of the hand and forearm

Question 31

Reflex C7

Answer 31

Triceps

Question 32

Motor Radial Nerve

Answer 32

(C5, C6, C7, C8)

-All muscles in the posterior compartment of the arm and forearm (extension muscles)

Question 33

Sensory Radial Nerve

Answer 33

(C5, C6, C7, C8)
-Skin on the posterior aspect of the arm and forearm, lower lateral surface of the arm, and dorsal lateral surface of the hand

Question 34

Reflex Radial Nerve

Answer 34

• Brachioradialis

- Triceps

Question 35

Motor C8

Answer 35

Finger Flexion muscles

Question 36

Sensory C8

Answer 36

Tip of the 5th digit and medial aspect of the hand and forearm

Question 37

Reflex C8

Answer 37

Finger Flexion

Question 38

Motor Ulnar Nerve

Answer 38

(C8, T1)

• All intrinsic muscles of the hand
• Flexor carpi ulnaris
• 1/2 of flexor digitorium profundus

Question 39

Sensory Ulnar Nerve

Answer 39

(C8, T1)
-Skin over the palmar surface of the medial 1 and 1/2 digits and associated palm and wrist, and skin over the dorsal surface of the medial one and one half digits.

Question 40

Reflex Ulnar Nerve

Answer 40

Finger Flexion

Question 41

Motor for T1

Answer 41

• Finger Abductors

- Finger Adductors

Question 42

Sensory T1

Answer 42

Medial aspect of the lower arms