Upper Limb Nerves

Question 1

From which spinal nerves is the brachial plexus formed?

Answer 1

C5 to T1

Question 2

What is the source of the cutaneous nerve for the medial aspect of the upper part of the arm?

Answer 2

Derived from T2

Question 3

What skin area does the upper lateral cutaneous nerve of the arm supply?

Answer 3

Over the lower ½ of the deltoid

Question 4

What skin areas are supplied by the lateral cutaneous nerve of the forearm?

Answer 4

Anterior and posterior aspect of the lateral part of the forearm and the proximal part of the thenar eminence

Question 5

Which nerve supplies the lateral aspect of the arm from the deltoid tuberosity to the elbow?

Answer 5

Lower lateral cutaneous nerve of arm (C5 & C6)

Question 6

Which nerve supplies the posterior aspect of the arm?

Answer 6

Radial nerve

Question 7

Which cutaneous nerves supply the shoulder over ½ of the deltoid?

Answer 7

Lateral supraclavicular nerves (C3 & 4)

Question 8

What do the lateral and medial terminal divisions of the median nerve supply?

Answer 8

Palmar surface as well as the dorsal surface of distal and middle phalanges of the lateral 3-1/2 fingers

Question 9

Which nerve supplies the lower half of the medial aspect of the arm?

Answer 9

Medial cutaneous nerve of arm (C8 & T1)

Question 10

Which nerve supplies the middle of the back of the forearm?

Answer 10

Posterior cutaneous nerve of forearm (C5 – C8)

Question 11

What does the intercostobrachial nerve supply?

Answer 11

Upper half of the medial aspect of the arm

Question 12

Which nerve supplies the lateral two-thirds of the palm of the hand?

Answer 12

Palmar cutaneous branch of median nerve

Question 13

What is the function of the medial cutaneous nerve of the forearm?

Answer 13

Supplies the anterior and posterior aspect of the medial part of the forearm

Question 14

What is the cutaneous nerve of the arm that runs from the deltoid tuberosity to the elbow?

Answer 14

Cutaneous nerve of arm (C5 – C8)

Question 15

Which nerve supplies the medial one-third of the palm of the hand?

Answer 15

Palmar cutaneous branch of ulnar nerve

Question 16

What area does the superficial terminal branch of the ulnar nerve supply?

Answer 16

Palmar surface of medial 1-1/2 fingers

Question 17

What area does the dorsal cutaneous branch of the ulnar nerve supply?

Answer 17

Medial 1/3 of the dorsum of the hand and the dorsal aspect of medial 1-1/2 fingers

Question 18

What area does the superficial radial nerve supply?

Answer 18

Lateral 2/3 of the dorsum of the hand, proximal part of the thenar eminence, and dorsal aspect of the proximal phalanx of the lateral 3-1/2 fingers

Question 19

Which dermatome includes the lateral part of the hand with the thumb and index fingers?

Answer 19

C6

Question 20

Which spinal segment corresponds to the upper half of the deltoid?

Answer 20

C4

Question 21

What does the C7 dermatome supply?

Answer 21

Middle finger and central part of hand and forearm

Question 22

What does the T2 dermatome cover?

Answer 22

Medial aspect of upper part of arm and floor of axilla

Question 23

What is a dermatome?

Answer 23

A segment of skin supplied by a specific segment of spinal cord

Question 24

Which dermatome corresponds to the little and ring fingers?

Answer 24

C8

Question 25

What areas does the C5 dermatome cover?

Answer 25

Lower half of deltoid, lateral aspect of arm, and upper part of lateral aspect of forearm

Question 26

What areas are supplied by the T1 dermatome?

Answer 26

Medial aspect of upper part of forearm and lower part of arm

Question 27

What is the segmental nerve supply of the upper limb?

Answer 27

The segmental nerve supply of the upper limb involves spinal nerves C3, C4, C5, C6, C7, C8, T1, T2

Question 28

What is the significance of T1 in the upper limb nerve supply?

Answer 28

It contributes to the innervation of the upper limb

Question 29

Which spinal nerve is associated with the hand in the diagram?

Answer 29

C8

Question 30

Which spinal nerves are indicated in the segmental nerve supply of the upper limb?

Answer 30

C3, C4, C5, C6, C7, C8, T1, T2

Question 31

Describe the anterior/posterior view of the segmental nerve supply of the upper limb.

Answer 31

The anterior view shows the distribution of nerves on the front side of the upper limb, while the posterior view shows the distribution on the back side

Question 32

What spinal segment is responsible for radioulnar supination?

Answer 32

C8

Question 33

Which spinal segments control wrist flexion and extension?

Answer 33

C6 and C7

Question 34

Which myotome do the intrinsic muscles of the hand constitute?

Answer 34

T1

Question 35

How are most muscles of the upper limb structured in relation to myotomes?

Answer 35

They are made up of more than one myotome, receiving motor fibers from several spinal cord segments

Question 36

What spinal segment is responsible for shoulder flexion, abduction, and lateral rotation?

Answer 36

C5

Question 37

Which spinal segments are responsible for radioulnar pronation?

Answer 37

C7 and C8

Question 38

What is a myotome?

Answer 38

A unilateral embryological muscle mass receiving innervation from a single spinal cord segment or spinal nerve

Question 39

Which spinal segments are involved in shoulder extension, adduction, and internal rotation?

Answer 39

C6, C7, and C8

Question 40

Which spinal segments are involved in finger adduction and abduction?

Answer 40

T1

Question 41

Which spinal segments are responsible for elbow flexion?

Answer 41

C5 and C6