Gross Lecture 2

Question 1

What are the three muscles in the flexor compartment of the arm?

Answer 1

biceps brachii, brachialis, coracobrachialis

Question 2

What nerve innervates the extensor compartment of the arm?

Answer 2

radial nerve

Question 3

What is the primary action of the anterior compartment of the arm?

Answer 3

flexion

Question 4

What are the three parts of the medial collateral ligament and where do they attach?

Answer 4

• anterior: from front of medial epicondyle of humerus to tubercle on medial margin of coronoid
• posterior: lower, back part of medial epicondyle to medial margin of the olecranon
• oblique: connects the distal attachments of the other two

Question 5

What is the main artery found in the posterior compartment of the forearm?

Answer 5

posterior interosseous branch of the common interosseous artery

Question 6

What nerve innervates the majority of the muscles in the anterior forearm?

Answer 6

musculocutaneous nerve

Question 7

During a blood draw which vein is normally used for venipuncture?

Answer 7

median cubital vein

Question 8

What is the action of the biceps brachii in pronation? Supination?

Answer 8

pronation: cannot flex the elbow in this position - the position that the radioulnar joint is kept in
supination: supinates the proximal radioulnar joint before it can flex the elbow

Question 9

What is the pathway of each tendon of flexor digitorum profundus?

Answer 9

divides into 4 tendinous slips, 1 for each finger - pass deep to the flexor retinaculum (carpal tunnel) - passes through split in the superficialis tendon to insert onto the base of the distal phalanx

Question 10

What does the nerve to the lateral forearm originate?

Answer 10

radial nerve - posterior cord of brachial plexus