Key ortho anatomy

Question 1

What are the nerve roots of the brachial plexus?

Answer 1

• C5
• C6
• C7
• C8
• T1

Question 2

What are the branches of the brachial plexus?

Answer 2

• Musculocutaneous (C5-C7)
• Axillary (C5-C6)
• Radial (C5-T1)
• Median (C6, C7, C8, T1)
• Ulnar (C8, T1)

Question 3

What is the motor function of the axillary nerve?

Answer 3

Shoulder abduction (deltoid)

Question 4

What is the sensory function of the axillary nerve

Answer 4

Inferior region of the deltoid muscle

Question 5

What injury causes axillary nerve damage?

Answer 5

Humeral neck fracture/dislocation

Question 6

What nerve injury is indicated by flattened deltoid?

Answer 6

Axillary nerve

Question 7

What is the motor function of the radial nerve?

Answer 7

Extension - forearm, wrist, fingers, thumb

Question 8

What is the sensory function of the radial nerve?

Answer 8

Small area between the dorsal aspect of the 1st and 2nd metacarpals

Question 9

What injury causes radial nerve damage?

Answer 9

Humeral midshaft fracture

Question 10

What nerve injury is indicated by wrist drop?

Answer 10

Radial nerve

Question 11

What is the motor function of the median nerve?

Answer 11

• Pronation of the forearm
• Wrist flexion
• Thumb flexion, thumb abduction

Question 12

What is the sensory function of the median nerve?

Answer 12

Palmer aspect of later 3.5 fingers

Question 13

What nerve injury is indicated by carpal tunnel syndrome?

Answer 13

Median nerve

Question 14

What is the motor function of the ulnar nerve?

Answer 14

• Finger abduction
• Finger adduction
• Thumb adduction

Question 15

What is the sensory function of the ulnar nerve?

Answer 15

Medal 1.5 fingers

Question 16

What injury results in ulnar nerve damage?

Answer 16

Medial epicondyle fracture

Question 17

What nerve injury is indicated by a ‘claw hand’?

Answer 17

Ulner nerve