Spinal Cord And Its Connections

Question 1

C3 - C4 - C5

Answer 1

Function: diaphragm excursion
Muscle: diaphragm
Peripheral Nerve: phrenic nerve

Question 2

C4 - C5

Answer 2

Function: shoulder shrug
Muscle: trapezius
Peripheral Nerve: spinal accessory nerve

Question 3

C5

Answer 3

Function: arm elevation and supinated forearm flexion
Muscle: deltoid and biceps brachii
PN: auxiliary nerve and musculocutaneous nerve

Question 4

C5 - C6

Answer 4

Function: neutral forearm flexion
Muscle: brachioradialis
PN: radial nerve

Question 5

C6 - C7

Answer 5

Function: elbow extension
Muscle: triceps
PN: radial nerve

Question 6

C6 - C7 - C8

Answer 6

Function: wrist extension
Muscle: extensor carpi radialis and ulnaris
PN: radial nerve

Question 7

C7 - C8

Answer 7

Function: wrist flexion
Muscle: flexor carpi radialis and ulnaris
PN: radial nerve

Question 8

C8 - T1

Answer 8

Function: grip and finger spreading
Muscle: adductor pollicis and dorsal interossei
PN: median and ulnar nerve