MSK 6

Which structure does NOT pass through the cubital fossa? 

• Median nerve

• Ulnar nerve

• Brachial artery 

• Biceps tendon 

Answer explanation

Ulnar nerve passess posterior to the medial epicondyle of the elbow

Which structure does NOT pass through the carpal tunnel?

• Median nerve

• Flexor digitorum superficialis

• Ulnar nerve 

• Flexor digitorum profundus 

Answer explanation

Ulnar nerve travels through Guyons canal which similarly can compress the ulnar nerve in the event of raised pressure - Guyon's Canal Syndrome

Which one of these movements used the biceps and supinator muscles?

• A

• B

Answer explanation

B - Supination uses both biceps and supinator muscles. Pronation (shown in A) uses the brachioradialis, pronator teres and pronator quadratus muscles.

All muscles in the posterior compartment of the forearm cause extension. True or false? 

• True

• False

Answer explanation

False. The brachioradialis, although in the posterior compartment, actually flex the forearm at the elbow and help with pronation.

Which muscle is tested in this test? 

• Flexor digitorum profundus 

• Flexor digitorum superficialis 

• Flexor digitorum longus 

• Flexor digitorum brevis 

Which carpal bone is labelled on the XR?

• Triquetrum

• Pisiform

• Trapezium

• Lunate

Fracture of which carpal bone would lead to avascular necrosis?

• Scaphoid

• Triquestrum

• Trapezium

• Lunate

Answer explanation

The scaphoid's blood supply travels distally to proximal. Therefore fracture of the scaphoid could damage the distal end of the radial artery and cause necrosis in proximal regions.

Lesion of what nerve leads to this abnormality?

• Radial nerve

• Axillary nerve

• Ulnar nerve

•  Musculocutaneous nerve

Answer explanation

Ulnar "claw hand" - loss of sensation in the medial 1.5 fingers of the hand. No supply to flexor carpi ulnaris and median half of flexor digitorum profundus.