UPPER ARM AND ELEBOW 1. The lower humerus is divided into two parts. The capitulum which receives the head of the radius and the Medial epicondyle Coronoid fossa Trochlea Lateral epicondyle Olecranon fossa Right. No, C is correct. The Trochlea receives the Trochlear Notch (semilunar notch) of the Ulna. 2. In addition to the radial and coronoid fossae which receive the head of the radius and tip of the ulna coronoid process respectively, is a large fossa behind the distal humerus called the Spiral groove Olecranon fossa Supracondylar ridge Deltoid tuberosity A and C above Very good. No, B is the answer. The olecranon fossa receives the olecranon of the ulna when the elbow is fully extended. 3. The lower half of the humerus becomes flattened and the intermuscular septa are attached to the lateral extensions called the Deltoid tuberosity Olecranon Supracondylar ridges Spiral groove Deltoid tuberosity Very good. Wrong, C is the answer. The supracondylar ridges ascend from the medial and lateral epicondyles. 4. Between the lateral supracondylar ridge and the deltoid tuberosity is the Medullary foramen Spiral groove Coronoid fossa Excellent! The radial nerve is in the spiral groove. Wrong, B is the answer. The radial nerve is in the spiral groove. 5. The coraco-brachialis insertion is about one inch long on a roughened area on the Lateral supracondylar ridge Medial supracondylar ridge Lateral epicondyle Deltoid tuberosity Capitulum Great! Come now, B is the answer. 6. Medial and lateral borders for the full length of the humerus have been identified. The medial border extends from the lesser tuberosity (where the subscapularis inserts) to the Medial epicondyle Lateral epicondyle Deltoid tuberosity Medial supracondylar ridge Trochlea Very good. No, A is the answer. 7. The lateral border of the humerus extends from the lowest facet of the greater tuberosity (insertion of teres minor) to the Lateral epicondyle Medial epicondyle Spiral groove Lateral supracondylar ridge Capitulum You are right. You are wrong. A is correct. 8. The muscles of the arm are wrapped in the sleeve of deep fascia which is divided into an anterior and posterior compartment by the medial and lateral intermuscular fascial septa between the deep fascia and Spiral groove Supracondylar ridges Epicondyles Yes. No, the answer is B. 9. In the anterior muscle compartment are the Coraco-brachialis Biceps brachii Brachialis Triceps brachii A, B, and C above Of course. Partly, E is the answer. These are the 3 muscles of the anterior compartment. 10. The muscle(s) in the posterior compartment Triceps brachii Brachialis Coraco-brachialis Deltoid A, B, and C above Very good. There is one muscle in the posterior compartment. No, the answer is A. There is one muscle in the posterior compartment. 11. Two of the muscles just discussed have at least part of their origins from the coracoid process. They are the short head of the biceps and Triceps brachii Coraco-brachialis Brachialis Right. The origins are tendinous. No, B is right. The origins are tendinous. 12. The long head of the biceps originates from the supraglenoid tubercle and the Anterior rim of the glenoid cavity Posterior rim of the glenoid cavity Very good. No, the answer is B. 13. The long and short heads of the biceps unite near the middle of the arm and their common tendon is inserted in the posterior half of the Supracondylar ridge Lateral epicondyle Tuberosity of the radius Capitulum Trochlea Great! No, C is the answer. The biceps also inserts into the fascia covering the forearm flexors via the bicipital aponeurosis. 14. Based on the insertion of the biceps onto the radius, contraction of the biceps would be expected to Supinate the forearm Pronate the forearm Marvelous! No, A is the answer. 15. The brachialis arises from the anterior aspect of the lower humerus and inserts on the Tuberosity of the radius Coronoid process of the ulna Coracoid process of the scapula Deltoid tuberosity of the humerus Capitulum of the humerus Hooray! Wrong, the answer is B. Since the brachialis inserts on the ulna, contraction of this muscle causes flexion of the elbow joint. 16. The coraco-brachialis passes from scapula to humerus and flexes and adducts the Shoulder joint Elbow joint Radio-ulnar joint Very good. No, the answer is A. In addition to being a supinator of the radio-ulnar joint, contraction of the biceps does what brachialis and coracobrachialis do together, flex and adduct the shoulder joint and flex the elbow joint. 17. The long head of the triceps arises from the Supraglenoid tubercle Infraglenoid tubercle Coracoid process Magnificent! Incorrect, B is the answer. This head separates the triangular space from the quadrangular space. 18. The triceps also has two heads (medial and lateral) arising from the humerus. The common tendon of insertion is primarily on the Head of the radius Olecranon Medial epicondyle Capitulum Trochlea You are right! Wrong, B is the answer. Some fibers extend distally forming the "tricipital aponeurosis". 19. The triceps action on the elbow joint is Flexion Extension Hooray! No, B is correct. The chief function of the triceps is to keep the elbow extended, prevent flexion. 20. The nerve supply to the triceps is Ulnar nerve Radial nerve Median nerve Axillary Musculocutaneous Great. No, B is correct. The posterior muscles, like others, is innervated by nerves from the posterior cord of the brachial plexus; in this case, the radial nerve. 21. When the elbow is flexed 90 degrees and the forearm forcibly supinated, the tight tendon easily grasped between thumb and index finger at the middle of the front of the elbow is the Triceps tendon Biceps tendon Brachialis tendon Coracobrachialis tendon Supinator tendon Marvelous! No, B is the answer. 22. With the biceps relaxed in this flexed position, the pulsations of the brachial artery can be felt Lateral to the biceps tendon Medial to the biceps tendon Hooray! No, B is the answer. With a little care, one can feel the median nerve just medial to the pulsating artery. It is a firm, cord like structure on the brachialis. 23. The ulnar nerve is behind the Medial epicondyle Lateral epicondyle Olecranon process Right. Wrong. A is the correct answer. The nerve in this location is easily injured making one aware of its sensory distribution to half the ring finger and all of the small finger. 24. Although not palpable, the nerve along the lateral border of the biceps is the Median nerve Musculo-cutaneous nerve Radial nerve Axillary nerve Ulnar nerve Bravo! No, the answer is B. 25. The Axillary Artery after crossing the Subscapularis, Latissimus Dorsi, and Teres Major becomes the Radial artery Ulnar artery Brachial artery Marvelous! Wrong, C is correct. The brachial artery pulsations can be palpated along the medial bicipital furrow and length of the arm to the bicipital aponeurosis. 26. At the level of the neck of the radius, the brachial artery usually divides into the Ulnar artery Radial artery Both Yes, the ulnar artery is larger. No, the answer is C. The ulnar artery is larger.