Intermediate Posterior Compartment of the Forearm Quiz

Q1. Which bony landmark provides the common extensor origin for several superficial posterior forearm muscles?

• Medial epicondyle of the humerus
• Coracoid process
• Lateral epicondyle of the humerus
• Radial styloid process

Q2. Which group consists entirely of deep posterior forearm muscles?

• Extensor digitorum, extensor digiti minimi, extensor carpi ulnaris, flexor carpi radialis, and palmaris longus
• Pronator teres, flexor carpi radialis, flexor digitorum superficialis, and pronator quadratus
• Flexor digitorum profundus, flexor pollicis longus, supinator, and pronator quadratus
• Supinator, abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus, and extensor indicis

Q3. Through which muscle does the deep branch of the radial nerve pass?

• Brachialis
• Supinator
• Flexor digitorum superficialis
• Pronator teres

Q4. What does the deep branch of the radial nerve become after emerging from the supinator?

• Posterior interosseous nerve
• Superficial radial nerve
• Lateral cutaneous nerve of the forearm
• Anterior interosseous nerve

Q5. Which posterior forearm muscle is supplied directly by the radial nerve and flexes the elbow?

• Extensor digitorum
• Extensor pollicis longus
• Brachioradialis
• Extensor indicis

Q6. Which posterior forearm muscle extends and abducts the hand at the wrist?

• Flexor carpi ulnaris
• Extensor carpi ulnaris
• Extensor carpi radialis longus
• Palmaris longus

Q7. What is the primary function of the extensor retinaculum at the wrist?

• It contains the median nerve within its fibers
• It restrains the extensor tendons close to the wrist
• It flexes the wrist directly
• It forms the floor of the carpal tunnel

Q8. Which artery is an important source of blood supply to the posterior forearm compartment?

• Superior thoracic artery
• Posterior circumflex humeral artery
• Posterior interosseous artery
• Thoracoacromial artery

Q9. Which tendon forms the medial boundary of the anatomical snuffbox?

• Abductor pollicis longus tendon
• Flexor pollicis longus tendon
• Extensor pollicis longus tendon
• Extensor pollicis brevis tendon

Q10. Which tendons form the lateral boundary of the anatomical snuffbox?

• Abductor pollicis longus and extensor pollicis brevis tendons
• Extensor pollicis longus and extensor indicis tendons
• Extensor digitorum and extensor digiti minimi tendons
• Flexor pollicis longus and flexor carpi radialis tendons