Forearm Muscles Anatomy Quiz
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Questions and Answers

Which muscle assists in the extension of the elbow?

  • Extensor digitorum
  • Anconeus (correct)
  • Extensor carpi radialis longus
  • Brachioradialis

    • What is the action of the brachioradialis muscle?

  • Extends the wrist
  • Abducts the hand
  • Extends the fingers
  • Flexes the elbow in mid prone position (correct)

    • Which of the following muscles is responsible for extending the metacarpophalangeal (MP) and interphalangeal (IP) joints of the medial four fingers?

  • Extensor digiti minimi
  • Extensor digitorum (correct)
  • Extensor carpi ulnaris
  • Anconeus

    • Which muscle originates from the lateral supracondylar ridge?

    <p>Brachioradialis (A)</p> Signup and view all the answers

    What action is primarily performed by the extensor carpi radialis longus?

    <p>Extends and abducts the hand at the wrist joint (A)</p> Signup and view all the answers

    Where does the extensor carpi ulnaris insert?

    <p>Fifth metacarpel bone (A)</p> Signup and view all the answers

    Which muscle is classified as the short muscle in the posterior compartment of the forearm?

    <p>Anconeus (B)</p> Signup and view all the answers

    Which muscle does NOT run along the lateral border of the forearm?

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

    What condition is characterized by pain and tenderness on the outside of the elbow due to overuse?

    <p>Tennis elbow (B)</p> Signup and view all the answers

    Which muscle is responsible for supinating the extended arm?

    <p>Supinator (B)</p> Signup and view all the answers

    Which muscle extends the joints of the little finger?

    <p>None of the above (D)</p> Signup and view all the answers

    What is the primary function of the abductor pollicis longus?

    <p>Abducts and extends the thumb (D)</p> Signup and view all the answers

    From which structure does the posterior interosseous nerve arise?

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

    Which muscle inserts into the base of the distal phalanx of the thumb?

    <p>Extensor pollicis longus (B)</p> Signup and view all the answers

    Which muscle primarily extends the proximal phalanx of the thumb?

    <p>Extensor pollicis brevis (B)</p> Signup and view all the answers

    Which of the following muscles is NOT supplied by the posterior interosseous nerve?

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

    Flashcards

    Tennis Elbow (Lateral Epicondylitis)

    A painful condition of the elbow caused by overuse, resulting in inflammation of tendons connecting forearm muscles to the outer elbow.

    Extensor Group of Forearm Muscles

    A muscle group located on the back of the forearm, responsible for extending the wrist and fingers.

    Supinator Muscle

    One of the extensor muscles located in the deep group, responsible for supinating (turning palm up) the extended arm.

    Abductor Pollicis Longus

    A muscle in the deep extensor group, responsible for abducting and extending the thumb at the carpometacarpal joint.

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    Extensor Pollicis Brevis

    A deep extensor muscle that extends the thumb's proximal phalanx.

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    Extensor Pollicis Longus

    The longest extensor muscle, responsible for extending the thumb's distal phalanx.

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    Extensor Indicis

    A deep extensor muscle that extends the joints of the index finger.

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    Posterior Interosseous Nerve

    A nerve that supplies most of the extensor muscles in the forearm, arising from the radial nerve.

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    What is the Anconeus?

    The Anconeus is a small, triangular-shaped muscle located on the back of the elbow.

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    What is the action of the Brachioradialis?

    The Brachioradialis helps flex the elbow when the forearm is in a mid-prone position.

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    What is the origin and insertion of the Extensor carpi radialis longus (ECRL)?

    Extensor carpi radialis longus (ECRL) originates from the lateral supracondylar ridge of the humerus and inserts on the second metacarpal bone.

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    What is the action of the Extensor carpi radialis brevis (ECRB)?

    Extensor carpi radialis brevis (ECRB) helps extend and abduct the hand at the wrist.

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    What is the action of the Extensor digitorum?

    The Extensor digitorum extends the metacarpophalangeal (MP) and interphalangeal (IP) joints of the medial four fingers.

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    What is the action of the Extensor carpi ulnaris (ECU)?

    Extensor carpi ulnaris (ECU) helps extend and adduct the hand at the wrist.

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    What is the origin and insertion of the Extensor digiti minimi?

    Extensor digiti minimi originates from the common extensor origin and inserts on the extensor expansion of the little finger.

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    What is the action of the Extensor carpi radialis longus?

    The Extensor carpi radialis longus extends and abducts the hand at the wrist joint.

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    Study Notes

    Forearm Muscles

    • The posterior compartment of the forearm contains muscles responsible for wrist and digit extension, and supination of the hand.
    • There are 12 muscles in this compartment, organized into superficial and deep groups.

    Superficial Group

    • This group comprises 7 muscles:
      • Anconeus: A short, triangular muscle on the back of the elbow. Originates from the lateral epicondyle of the humerus and inserts into the posterolateral surface of the olecranon. Its action is assisting in extension of the elbow.
      • Brachioradialis: Runs along the lateral border of the forearm. Its origin is from lateral supracondylar ridge. It inserts into the base of the styloid process of radius. Its action is flexing the elbow in mid-prone position.
      • Extensor carpi radialis longus: Originates from the lateral supracondylar ridge, inserts into the second metacarpal bone, and its action is extending and abducting the hand at the wrist.
      • Extensor carpi radialis brevis: Originates from the common extensor origin, inserts into the base of the third metacarpal bone, and its action is extending and abducting the hand at the wrist joint.
      • Extensor digitorum: Originates from the common extensor origin and inserts through extensor expansion. It extends the metacarpophalangeal (MP) and interphalangeal (IP) joints of the medial four fingers.
      • Extensor digiti minimi: Originates from the common extensor origin. Its tendon joins the extensor expansion of the little finger and extends all joints of the little finger.
      • Extensor carpi ulnaris: Originates from the common extensor origin, inserts into the fifth metacarpal, and extends and adducts the hand at the wrist.

    Deep Group

    • This group has 5 muscles; one is short and four are long.
      • Supinator: Is a short muscle, and originates by two heads. It inserts into the lateral surface of the radius. Its action is supinating the extended arm.
      • Abductor pollicis longus: Originates from the posterior surface of radius and ulna, inserts into the first metacarpal, and abducts and extends the thumb at the carpometacarpal joint.
      • Extensor pollicis brevis: Originates from the posterior surface of radius, inserts into the base of the proximal phalanx of the thumb, and extends the proximal phalanx of the thumb.
      • Extensor pollicis longus: Originates from the posterior surface of ulna, inserts into the base of the distal phalanx, and extends the distal phalanx of the thumb.
      • Extensor indicis: Originates from the posterior surface of ulna, inserts into the extensor expansion of the index finger, and extends the joints of the index finger.

    Nerve Supply

    • Anconeus, brachioradialis, and extensor carpi radialis longus are supplied by the radial nerve.
    • The remaining muscles are supplied by the posterior interosseous nerve, a branch of the radial nerve.

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    Related Documents

    MMB 020 Forearm II PDF

    Description

    Test your knowledge on the muscles of the posterior compartment of the forearm. This quiz covers both superficial and deep muscle groups, including their origins, insertions, and actions. Challenge yourself to recall important details about each muscle's function and anatomy!

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