nerves

Question 1

Nerves of the arm and forearm

Answer 1

Musculocutaneous nerve, radial nerve, median nerve and ulnar nerve

Question 2

Musculocutaneous nerve

Answer 2

Innervates muscles of the anterior arm. Lateral cutaneous nerve of the forearm - lateral aspect of forearm

Nerve roots C5-7

Question 3

Radial nerve

Answer 3

Innervates muscles of the posterior arm and posterior compartment of the forearm
Nerve roots C5-T1

Question 4

Lower lateral cutaneous nerve of arm

Answer 4

Innervates the lateral aspect of the upper arm, below the delts

C5-C6

Question 5

Posterior cutaneous nerve of arm

Answer 5

Innervates the posterior surface of the upper arm
C6-C8

Question 6

Posterior cutaneous nerve of forearm

Answer 6

Innervates a strip of skin down the middle of the posterior forearm
C6-C8

Question 7

Superficial branch of radial nerve

Answer 7

Innervates the dorsal surface of the hand and lateral 3 and half digits and dorsum of thumb
C7-C8

Question 8

Median nerve

Answer 8

Innervates muscles of the anterior (flexor) compartment of the forearm. Thenar muscles of the hand and first two lumbricals

Nerve roots C6-T1

Question 9

Palmar cutaneous branch of radial

Answer 9

Innervates lateral aspect of palm

Question 10

Palmar digital cutaneous branch of radial

Answer 10

Innervates the palmar surface and fingertips of the lateral three and half digits

Question 11

Ulnar nerve

Answer 11

Innervates two muscles of the anterior compartment of the forearm: flexor digitorum profundus and flexor carpi ulnaris

Nerve roots: C8-T1

Question 12

Palmar cutaneous branch of ulnar

Answer 12

Innervates the skin of the medial half of the palm

Question 13

Dorsal cutaneous branch of ulnar

Answer 13

Innervates skin of dorsal surface of medial aspect of the hand and medial one and half fingers

Question 14

Superficial branch of ulnar

Answer 14

Innervates the palmar surface of the medial one and a half fingers

Question 15

Axillary Nerve

Answer 15

Gives of superior lateral cutaneous nerve of the arm, which innervates the inferior region of the deltoid. C5-C6

Deltoids, teres major

Question 16

Medial brachial cutaneous nerve from medial cord

Answer 16

Innervates medial surface of upper arm

Question 17

Medial antebrachial cutaneous nerve of medial cord

Answer 17

Innervates anterior surface of the arm and medial surface of the lower arm

Question 18

Musculocutaneous nerve injury

Answer 18

Flexion of the shoulder and elbow and supination of forearm are weakened
Pec and brachioradialis unaffected

Loss of sensation (lateral aspect)

Question 19

Radial nerve injury - In Axilla

Answer 19

Loss of function of all muscles innervated by radial nerve. Wrist drop
Loss of sensation

Question 20

Radial nerve injury - in radial groove

Answer 20

Weakening of triceps, loss of function of muscles in posterior forearm.

Some innervation of triceps above radial groove

Question 21

Radial nerve injury in forearm - Deep branch (posterior interosseous nerve)

Answer 21

Majority of muscles in posterior forearm are affected. Wrist drop doesn’t occur. Some innervation occurs at top of forearm.

Question 22

Radial nerve injury in forearm - Superficial branch

Answer 22

Loss of sensation of dorsal three and half of digits

Question 23

Median nerve injury

Answer 23

Damage at elbow, pronation of forearm affected, weak flexion of the wrist, opposition of thumb and flexion of first two fingers affected.

Damage at wrist - Thenar muscles and lateral two lumbricals. Opposition of thumb and flexion of first two fingers affected

Question 24

Median nerve injury - carpal tunnel syndrome

Answer 24

Caused by nerve being trapped in carpal tunnel
Leads to numbness of areas of hand innervated by median nerve
Get thenar wasting

Question 25

Ulnar nerve injury

Answer 25

Damage to medial epicondyle, flexion of wrist can still occur but is accompanied by abduction Get impairment of muscles of the hand innervated by ulnar nerve. Finger ab/adduction affection with flex/extension of index and ring finger Loss of sensation from medial aspect of hand and fingers.