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 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
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
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
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
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 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
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
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 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
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
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
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
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
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
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