Select the one best response to each question!
Which muscle assists in extension of the forearm, resists abduction of the ulna during pronation of the forearm, and tenses the capsule of the elbow joint so that it is not pinched when the joint is extended?
The anconeus assists in extension of the forearm, resists abduction of the ulna during pronation of the forearm, and tenses the capsule of the elbow joint so that it is not pinched when the joint is extended
Which of the following is a branch of the brachial artery?
The axillary artery gives rise to the superior thoracic, thoracoacromial, lateral thoracic, subscapular, and anterior and posterior circumflex humeral arteries. The brachial artery gives rise to the deep artery of the arm, the nutrient humeral artery, and the superior and inferior collateral arteries. The ulnar artery gives rise to the anterior and posterior ulnar recurrent, common interosseous, anterior and posterior interosseous, and dorsal and palmar carpal branch arteries
Which of the following nerves supply NO branches to the arm?
The median and ulnar nerves supply no branches to the arm
Which of the following nerves is correctly paired with its cutaneous branch?
The median nerve gives rise to a palmar cutaneous branch; the ulnar nerve as well has a palmar cutaneous branch. The radial nerve gives rise to the posterior brachial cutaneous nerve, the posterior antebrachial cutaneous nerve, the inferior lateral brachial cutaneous nerve, and a superficial branch that innervates the dorsum of the hand and the digits. The musculocutaneous nerve continues as the lateral antebrachial cutaneous nerve. The axillary nerve gives rise to the superior lateral brachial cutaneous nerve. The medial cord of the brachial plexus gives rise to the medial brachial cutaneous nerve and the medial antebrachial cutaneous nerve. The supraclavicular nerves (from C3–C4) and the intercostobrachial nerve (from T2) also contribute to the cutaneous innervation of the arm
The cubital fossa does NOT contain which of the following?
The cubital fossa contains the terminal part of the brachial artery (and the beginning of the ulnar and radial arteries), deep accompanying veins, the median nerve, and the biceps brachii tendon. In the tissue superficial to the fossa are the median cubital vein and medial and lateral antebrachial cutaneous nerve. The deep and superficial branches of the radial nerve are within the floor of the fossa
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A patient is unable to flex the arm and forearm. Where is the lesion likely to be?
A patient who is unable to flex the arm and forearm is likely to have a lesion in the ventral rami of C5, C6, and C7. The biceps brachii and brachialis receive fibers from C5 and C6, and the coracobrachialis receives fibers from C5, C6, and C7. C6 is the main source of fibers for each
The radial nerve innervates muscles in the extensor compartment of the forearm, but it also innervates the following flexor:
The brachioradialis is a flexor of the forearm, but it is located in the extensor compartment and is innervated by the radial nerve
Which muscle does NOT cross the elbow joint?
The superficial muscles (pronator teres, flexor carpi radialis, palmaris longus, flexor carpi ulnaris, and flexor digitorum superficialis) cross the elbow joint. The deep muscles (flexor digitorum profundus, flexor pollicis longus, and pronator quadratus) do not
The ulnar nerve innervates which of the following muscles in the flexor compartment?
All muscles in the anterior compartment of the forearm are innervated by the median nerve, except for the flexor carpi ulnaris and the medial part of the flexor digitorum profundus, which are innervated by the ulnar nerve
The radial artery lies just lateral to the tendon of which muscle?
The radial artery lies lateral to the tendon of the flexor carpi radialis
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The palmaris longus tendon is a useful guide to which nerve at the wrist?
The palmaris longus tendon is a guide for locating the median nerve at the wrist
To pronate the forearm, which of the following must occur?
To pronate the forearm, the pronator quadratus initiates pronation, assisted later by the pronator teres
The extensor carpi radialis longus tendon is crossed by which two muscles?
The extensor carpi radialis longus tendon is crossed by the abductor pollicis longus and extensor pollicis brevis
Which of the following is true in respect to the supinator?
The supinator, which forms the floor of the cubital fossa along with the brachioradialis, is innervated by the deep branch of the radial nerve. It supinates the forearm by rotating the radius. The biceps brachii also supinates the forearm when the forearm is already flexed
Which of the following does NOT take an origin from the lateral epicondyle of the humerus?
The abductor pollicis longus originates from the posterior surfaces of the ulna, radius, and interosseous membrane. The following muscles take at least one of their origins from the lateral epicondyle of the humerus: extensor carpi radialis brevis, extensor digitorum, extensor digiti minimi, extensor carpi ulnaris, and supinator
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| 31. Which muscle assists in extension of the forearm, resists abduction of the ulna during pronation of the forearm, and tenses the capsule of the elbow joint so that it is not pinched when the joint is extended? (A) anconeus (B) triceps brachii (C) coracobrachialis (D) brachialis (E) biceps brachii |
| Which of the following is a branch of the brachial artery? (A) anterior and posterior circumflex humeral arteries (B) deltoid artery (C) superior and inferior ulnar collateral arteries (D) thoracoacromial artery (E) anterior and posterior ulnar recurrent arteries |
| 33. Which of the following nerves supply NO branches to the arm? (A) musculocutaneous and median (B) radial and ulnar (C) median and ulnar (D) median and radial (E) musculocutaneous and radial |
| 34. Which of the following nerves is correctly paired with its cutaneous branch? (A) median nerve and medial antebrachial cutaneous nerve (B) musculocutaneous nerve and lateral antebrachial cutaneous nerve (C) ulnar nerve and posterior antebrachial cutaneous nerve (D) median nerve and medial brachial cutaneous nerve (E) radial nerve and superior lateral brachial cutaneous nerve |
| 35. The cubital fossa does NOT contain which of the following? (A) terminal part of the brachial artery (B) deep accompanying veins of the arteries (C) median nerve (D) biceps brachii tendon (E) ulnar nerve |
| 36. A patient is unable to flex the arm and forearm. Where is the lesion likely to be? (A) ventral rami of C3–C4 (B) ventral rami of C5–C6–C7 (C) dorsal rami of C6–C7–C8 (D) ventral rami of C8–T1 (E) dorsal rami of T1 |
| 37. The radial nerve innervates muscles in the extensor compartment of the forearm, but it also innervates the following flexor: (A) brachioradialis (B) pronator teres (C) palmaris longus (D) pronator quadratus (E) palmaris longus |
| 38. Which muscle does NOT cross the elbow joint? (A) flexor pollicis longus (B) pronator teres (C) flexor carpi radialis (D) flexor carpi ulnaris (E) flexor digitorum superficialis |
| 39. The ulnar nerve innervates which of the following muscles in the flexor compartment? (A) the medial part of the flexor digitorum superficialis (B) flexor carpi radialis (C) pronator quadratus (D) pronator teres (E) the medial part of flexor digitorum profundus |
| 40. The radial artery lies just lateral to the tendon of which muscle? (A) pronator teres (B) flexor carpi radialis (C) palmaris longus (D) flexor carpi ulnaris (E) flexor digitorum superficialis |
| 41. The palmaris longus tendon is a useful guide to which nerve at the wrist? (A) anterior interosseous nerve (B) posterior interosseous nerve (C) median nerve (D) ulnar nerve (E) radial nerve |
| 42. To pronate the forearm, which of the following must occur? (A) The pronator quadratus initiates pronation, assisted later by the pronator teres. (B) The pronator teres initiates pronation, assisted later by the pronator quadratus. (C) The anconeus initiates pronation, assisted later by the pronator teres. (D) The pronator quadratus initiates pronation, assisted later by the anconeus. (E) The ulnar nerve must be used. |
| 43. The extensor carpi radialis longus tendon is crossed by which two muscles? (A) abductor pollicis longus and extensor pollicis longus (B) extensor indicis and extensor digitorum (C) extensor digitorum and extensor pollicis brevis (D) abductor pollicis longus and extensor pollicis brevis (E) extensor indicis and extensor carpi radialis brevis |
| 44. Which of the following is true in respect to the supinator? (A) It is innervated by the ulnar nerve. (B) It supinates the forearm by rotating the ulna. (C) It forms the floor of the cubital fossa along with the brachioradialis. (D) It supinates the forearm when the forearm is already flexed. (E) It rotates the radius to turn the palm anteriorly. |
| 45. Which of the following does NOT take an origin from the lateral epicondyle of the humerus? (A) extensor carpi radialis brevis (B) extensor carpi ulnaris (C) abductor pollicis longus (D) supinator (E) extensor digiti minimi |
