Brachial Plexus - Main branches

Question 1

Axillary nerve

Answer 1

C5, C6
Moto: deltoid, teres minor
Sensory: upper lateral part of arm (regimental badge area)

Question 2

Median nerve

Answer 2

C5-T1
Motor: muscles of anterior forearm, 3 thenar muscles, 2 lateral lumbricals EXCEPT flexor carpi ulnaris and medial 1/2 flexor digitorum profundus
Sensory: palm of lateral 3 & 1/2 digits, nail beds (dorsal)

Question 3

Ulnar nerve

Answer 3

C8, T1
Motor: Intrinsic muscles of hand EXCEPT 3 thenar muscles, 2 lateral lumbricals, lateral 1/2 flexor digitorum profundus
Sensory: medial (palmar and dorsal) of 1 & 1/2 digits + associated palm and dorsal area

Question 4

Radial nerve

Answer 4

C5-T1
Motor: posterior arm + forearm
Sensory: posterior arm + forearm, dorsal lateral thumb, palmar lateral 3 & 1/2 digits excluding distal phalanges

Question 5

Musculocutaneous nerve

Answer 5

C5, C6, C7

motor: anterior muscles of arm
sensory: skin on lateral forearm