Anatomy

Question 1

Musculocutaneous nerve - origin, motor, sensory, injury

Answer 1

C5-7
Elbow flexion, supination - biceps brachii
Lateral forearm
Isolated injury rare, part of brachial plexus

Question 2

Axillary nerve - origin, motor, sensory, injury

Answer 2

C5/6
Shoulder abduction - deltoid
Inferior region of deltoid
Humeral neck fracture/dislocation - Results in flattened deltoid

Question 3

Radial nerve - origin, motor, sensory, injury

Answer 3

C 5-8
Extension - forearm, wrist, fingers, thumb
Small area between the dorsal aspect of the 1st and 2nd metacarpals
Humeral midshaft fracture
Palsy -> wrist drop

Question 4

Medial - origin, motor, sensory, injury

Answer 4

C6,8, T1
LOAF muscles (Lateral two lumbricals, Opponens pollis, Abductor pollis brevis, Flexor pollis brevis)
Palmar aspect of lateral 3½ fingers
Wrist lesion - thenar paralysis, carpal tunnel
Elbow - loss of pronation, weak wrist flexion

Question 5

Ulnar nerve - origin, motor, sensory, injury

Answer 5

C8, T1
Intrinsic muscles of hand (except LOAF)
Medial 1 1/2 fingers
Medial epicondyle fracture, Damage may result in a ‘claw hand’

Question 6

Long thoracic nerve - origin, motor, sensory, injury

Answer 6

C5-7
Serratus anterior
Often during sport e.g. following a blow to the ribs. Also possible complication of mastectomy
Damage results in a winged scapula