Nerves

Question 1

Which spinal cord segments give rise to the superior trunk?

Answer 1

C5, C6

Question 2

Which spinal cord segment gives rise to the middle trunk?

Answer 2

C7

Question 3

Which spinal cord segments give rise to the inferior trunk?

Answer 3

C8, T1

Question 4

Which cord does the median nerve derive from?

Answer 4

Lateral cord and medial cord

Question 5

Which cord does the ulnar nerve derive from?

Answer 5

Medial cord

Question 6

Which cord does the radial nerve derive from?

Answer 6

Posterior cord

Question 7

Which cord does the musculocutaneus nerve derive from?

Answer 7

Lateral cord

Question 8

Which cord does the medial cutaneous nerve of arm derive from?

Answer 8

Medial cord

Question 9

Which cord does the medial cutaneous nerve of forearm derive from?

Answer 9

Medial cord

Question 10

Which cord does the axillary nerve derive from?

Answer 10

Posterior cord

Question 11

Name the nerves arising from the lateral cord which supply free upper limb.

Answer 11

Musculocutaneous nerve
Median nerve

Question 12

Name the nerves arising from the medial cord which supply free upper limb.

Answer 12

Median nerve
Ulnar nerve
Medial cutaneous nerve of the arm
Medial cutaneous nerve of the forearm

Question 13

Name the nerves arising from the posterior cord which supply free upper limb.

Answer 13

Axillary nerve
Radial nerve

Question 14

What are the terminal branches of the musculocutaneus nerve?

Answer 14

Sensory:
Lateral cutaneous nerve of the forearm

Motor:
Biceps brachii
Coracobrachialis
Brachialis

Question 15

Which muscle does the musculocutaneus nerve pierce?

Answer 15

Coracobrachialis

Question 16

Which nerve passes through the carpal tunnel?

Answer 16

Median nerve

Question 17

What nerve innervates the interossei?

Answer 17

The ulnar nerve

Question 18

Where is the cutaneous sensory area of the median nerve? How many half digits are supplied on the palmar side of the fingers incl. the thumb?

Answer 18

7 half digits (thumb, 2nd digit, 3rd digit, half of the 4th digit)

Question 19

How many half digits does the ulnar nerve supply on the palmar side?

Answer 19

3 half digits (5th digit and half of 4th digit)

Question 20

How many half digits does the ulnar nerve supply on the dorsal side?

Answer 20

3 half digits

Question 21

How many half digits does the radial nerve supply?

Answer 21

5 half digits