Anatomy of posterior Forearm Muscles Quiz
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Questions and Answers

Which muscle is primarily responsible for the supination of the forearm and hand?

  • Anconeus
  • Extensor digitorum
  • Supinator (correct)
  • Extensor carpi radialis longus
  • What is the insertion point of the Extensor carpi ulnaris?

  • Base of fifth metacarpal bone (correct)
  • Base of third metacarpal bone
  • Base of first metacarpal bone
  • Base of second metacarpal bone
  • Which structure covers the dorsum of the phalanges, excluding the thumb, and is also known as the extensor expansion?

  • Dorsal digital expansion (correct)
  • Anatomical snuff box
  • Radial fossa
  • Common extensor tendon
  • Which muscle inserts into the dorsal digital expansion?

    <p>Extensor indicis proprius</p> Signup and view all the answers

    What is the main artery supplying blood to the extensor aspect of the forearm?

    <p>Posterior interosseus artery</p> Signup and view all the answers

    Which of the following muscles is innervated by the deep branch of the radial nerve?

    <p>Extensor digiti minimi</p> Signup and view all the answers

    What is the innervation of the Supinator muscle?

    <p>Deep branch of radial nerve</p> Signup and view all the answers

    Which muscle originates from the common extensor tendon and inserts into the dorsal digital expansion?

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

    Which muscle is primarily responsible for flexing the forearm when it is pronated?

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

    What structure serves as the common origin for many of the extensor muscles of the posterior forearm?

    <p>Lateral epicondyle of humerus</p> Signup and view all the answers

    Which nerve innervates the majority of the extensor muscles in the posterior forearm?

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

    Which of the following is a deep muscle group in the posterior forearm?

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

    What is the primary action of the extensor carpi radialis longus muscle?

    <p>Extension of the forearm and hand</p> Signup and view all the answers

    Which superficial muscle forms the lateral border of the cubital fossa?

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

    What is the insertion point for the extensor carpi radialis longus?

    <p>Second metacarpal bone</p> Signup and view all the answers

    Which of the following muscles is NOT considered part of the superficial group in the posterior forearm?

    <p>Abductor pollicis longus</p> Signup and view all the answers

    Which muscle is responsible for the extension of the forearm at the elbow joint?

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

    What is the primary function of the dorsal digital expansion?

    <p>To provide attachment for extensor muscles</p> Signup and view all the answers

    Which muscle originates from the lateral epicondyle and contributes to supination?

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

    Which insertion corresponds with the extensor pollicis brevis?

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

    Which of the following groups forms the deep layer of extensor muscles?

    <p>Extensor indicis proprius</p> Signup and view all the answers

    Which muscle attaches to the base of the fifth metacarpal bone?

    <p>Extensor carpi ulnaris</p> Signup and view all the answers

    What is the primary blood supply to the extensor aspect of the forearm?

    <p>Posterior interosseous artery</p> Signup and view all the answers

    Which muscle associated with the common extensor tendon is responsible for extending the little finger?

    <p>Extensor digiti minimi</p> Signup and view all the answers

    What is the primary function of the brachioradialis muscle?

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

    Which muscle is responsible for the extension of the forearm and hand?

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

    From which structure do the extensor muscles primarily originate?

    <p>Common extensor tendon</p> Signup and view all the answers

    Which structure is NOT part of the deep group of muscles on the posterior aspect of the forearm?

    <p>Extensor carpi ulnaris</p> Signup and view all the answers

    What is the insertion point of the extensor carpi radialis longus muscle?

    <p>Second metacarpal bone</p> Signup and view all the answers

    Which muscle is innervated by the radial nerve?

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

    Where is the common extensor tendon located?

    <p>Lateral epicondyle of the humerus</p> Signup and view all the answers

    Which group of muscles is located more superficially in the posterior aspect of the forearm?

    <p>Extensor digiti minimi</p> Signup and view all the answers

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