MSK Lec 7 and 8 (sync/async)
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Questions and Answers

Which nerve innervates the brachioradialis muscle?

  • Radial nerve (correct)
  • Median nerve
  • Musculocutaneous nerve
  • Ulnar nerve

    • Which structure forms the carpal tunnel through which the flexor tendons and median nerve pass?

  • Extensor retinaculum
  • Antebrachial fascia
  • Flexor retinaculum (correct)
  • Synovial sheaths

    • Which muscle performs flexion with supination of the elbow joint?

  • Brachialis
  • Biceps (correct)
  • Triceps
  • Brachioradialis

    • What is the function of the retinacula?

    <p>To prevent bowstringing of the tendons during wrist flexion and extension</p> Signup and view all the answers

    Which structure invests the extensor tendons with synovial sheaths to reduce friction?

    <p>Extensor retinaculum</p> Signup and view all the answers

    Which muscle performs flexion with pronation of the elbow joint?

    <p>Brachialis</p> Signup and view all the answers

    Which nerve innervates the biceps muscle?

    <p>Musculocutaneous nerve</p> Signup and view all the answers

    What structure invests the forearm muscles?

    <p>Antebrachial fascia</p> Signup and view all the answers

    Which of the following statements is correct regarding the retinacula?

    <p>Both the extensor and flexor retinacula are formed by the thickening of the antebrachial fascia over the distal ends of the radius and ulna</p> Signup and view all the answers

    Which structure is not mentioned in the given text?

    <p>Interosseous membrane</p> Signup and view all the answers

    What is the origin of the ulnar head of the Pronator Teres muscle?

    <p>Coronoid process of ulna</p> Signup and view all the answers

    Which muscle is innervated by the ulnar nerve?

    <p>Flexor Carpi Ulnaris</p> Signup and view all the answers

    What is the function of the Pronator Teres muscle?

    <p>Flexion and pronation of the forearm</p> Signup and view all the answers

    Where does the Flexor Carpi Radialis muscle insert?

    <p>Base of the 2nd and 3rd metacarpals</p> Signup and view all the answers

    What is the anatomical structure that the Palmaris Longus muscle is associated with?

    <p>Flexor retinaculum</p> Signup and view all the answers

    What is the clinical significance of the median nerve passing between the two heads of the Pronator Teres muscle?

    <p>It can lead to median nerve entrapment, known as pronator syndrome.</p> Signup and view all the answers

    Which muscle is absent in 12-20% of the population?

    <p>Palmaris Longus</p> Signup and view all the answers

    Which of the following muscles is located in the intermediate layer of the anterior compartment of the forearm?

    <p>Flexor Digitorum Superficialis (FDS)</p> Signup and view all the answers

    What is the origin of the Flexor Digitorum Superficialis (FDS)?

    <p>Medial epicondyle of humerus and coronoid process of ulna (humero-ulnar head)</p> Signup and view all the answers

    What is the insertion of the Flexor Digitorum Profundus (FDP)?

    <p>Base of distal phalanges of fingers #2-5</p> Signup and view all the answers

    Which of the following muscles originates from the anterior surface of the radius and the interosseous membrane?

    <p>Flexor Pollicis Longus (FPL)</p> Signup and view all the answers

    What is the insertion of the Flexor Pollicis Longus (FPL)?

    <p>Base of distal phalanx of thumb</p> Signup and view all the answers

    Which of the following muscles is considered one of the carpal tunnel muscles?

    <p>Flexor Pollicis Longus (FPL)</p> Signup and view all the answers

    What is the origin of the Pronator Quadratus (PQ)?

    <p>Anterior surface of distal 1/4 of ulna</p> Signup and view all the answers

    Which muscle performs flexion of the elbow joint in mid-pronation position?

    <p>Brachioradialis</p> Signup and view all the answers

    What is the function of the extensor retinaculum?

    <p>Retains the extensor tendons in position</p> Signup and view all the answers

    Which nerve innervates the brachialis muscle?

    <p>Musculocutaneous nerve</p> Signup and view all the answers

    What is the function of the synovial sheaths around the extensor tendons?

    <p>Reduce friction between the extensor tendons and bones</p> Signup and view all the answers

    Which of the following structures is not mentioned in the given text?

    <p>Palmar fascia</p> Signup and view all the answers

    What is the function of the flexor retinaculum?

    <p>Converts the anterior concavity of the carpus into a carpal tunnel</p> Signup and view all the answers

    Which structure invests the forearm muscles?

    <p>Forearm (antebrachial) fascia</p> Signup and view all the answers

    Which muscle performs flexion of the elbow joint with supination?

    <p>Biceps brachii</p> Signup and view all the answers

    What is the function of the retinacula?

    <p>Prevent bowstringing of the tendons during hand flexion or hyperextension</p> Signup and view all the answers

    Which muscle performs flexion of the elbow joint with pronation?

    <p>Brachialis</p> Signup and view all the answers

    What is the primary cause of medial epicondylitis (golf elbow)?

    <p>Forceful and repeated bending of the wrist and fingers</p> Signup and view all the answers

    Which of the following muscles or tendons is most likely affected in lateral epicondylitis (tennis elbow)?

    <p>Extensor carpi radialis brevis tendon</p> Signup and view all the answers

    What is the terminal branch of the radial nerve that would be affected in a radial nerve injury?

    <p>All of the above</p> Signup and view all the answers

    Which muscle(s) would be affected in a radial nerve injury?

    <p>Brachioradialis</p> Signup and view all the answers

    Where does the radial artery pass in relation to the anatomical snuff box?

    <p>Deep to the extensor tendons</p> Signup and view all the answers

    What is the primary symptom of medial epicondylitis (golf elbow)?

    <p>Tenderness and pain at the medial epicondyle</p> Signup and view all the answers

    What is the primary symptom of lateral epicondylitis (tennis elbow)?

    <p>Tenderness and pain at the lateral epicondyle</p> Signup and view all the answers

    What is the most common cause of lateral epicondylitis (tennis elbow)?

    <p>Specific strain or overuse of the common extensor tendon</p> Signup and view all the answers

    Which of the following activities is NOT commonly associated with medial epicondylitis (golf elbow)?

    <p>Tennis</p> Signup and view all the answers

    What is the primary function of the extensor retinaculum?

    <p>To reduce friction of the extensor tendons</p> Signup and view all the answers

    Which muscle(s) is/are part of the Central Group of intrinsic hand muscles as described in the text?

    <p>Palmar Interosseous Muscles</p> Signup and view all the answers

    Where does the Palmar interosseous #3 muscle insert?

    <p>Little finger (finger #5)</p> Signup and view all the answers

    Which muscle originates from the anterior side of the metacarpal of finger #2?

    <p>Palmar interosseous #1</p> Signup and view all the answers

    Which Lumbrical muscle inserts into the dorsal digital expansion of the middle finger (finger #3)?

    <p>Lumbrical #2</p> Signup and view all the answers

    Where does the Dorsal interosseous #4 muscle attach?

    <p>Medial side of the ring finger</p> Signup and view all the answers

    To which metacarpal does Palmar interosseous #2 muscle attach?

    <p>Metacarpal #4</p> Signup and view all the answers

    Which group of muscles forms part of the Central Group of intrinsic hand muscles in the presented text?

    <p>Flexor Digitorum Profundus and Flexor Digitorum Superficialis</p> Signup and view all the answers

    Where does the Dorsal interosseous #3 muscle insert?

    <p>Medial side of the middle finger (finger #3)</p> Signup and view all the answers

    What is the origin of the Abductor Pollicis Brevis (APB) muscle?

    <p>Flexor retinaculum, tubercle of scaphoid, tubercle of trapezium</p> Signup and view all the answers

    What is the function of the Opponens Pollicis (OP) muscle?

    <p>Opposition of the thumb</p> Signup and view all the answers

    Which muscle originates from the pisiform bone?

    <p>Abductor Digiti Minimi (ADM)</p> Signup and view all the answers

    Which muscle inserts into the 5th metacarpal bone?

    <p>Opponens Digiti Minimi</p> Signup and view all the answers

    What is the origin of the oblique head of the Adductor Pollicis (AP) muscle?

    <p>Base of 2nd and 3rd metacarpal bones, capitate</p> Signup and view all the answers

    How many Lumbrical muscles are present in the hand?

    <p>4</p> Signup and view all the answers

    Which part of the hand is composed of the thumb, index, middle, ring, and little fingers?

    <p>Digits</p> Signup and view all the answers

    What is the long axis of the thumb in relation to the other fingers?

    <p>Perpendicular</p> Signup and view all the answers

    Which nerve passes through the Carpal Tunnel along with the flexor tendons?

    <p>Median nerve</p> Signup and view all the answers

    Which muscles of the hand are innervated by either the median or ulnar nerves?

    <p>Thenar, Hypothenar, Central</p> Signup and view all the answers

    Considering the movement of the thumb in relation to the fingers, what describes its motion accurately?

    <p>At a 90° angle to fingers</p> Signup and view all the answers

    What is the relative position of the long axis of the hand in terms of the third metacarpal bone and middle finger?

    <p><em>Anterior to both</em></p> Signup and view all the answers

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