Muscles of the Wrist and Fingers
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Muscles of the Wrist and Fingers

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Questions and Answers

Which muscle is responsible for flexion and abduction of the wrist?

  • Palmaris longus
  • Flexor carpi ulnaris
  • Flexor carpi radialis (correct)
  • Extensor carpi radialis longus

    • What is the origin of the flexor carpi ulnaris?

  • Base of fifth metacarpal
  • Lateral supracondylar ridge of humerus
  • Medial epicondyle of humerus (correct)
  • Lateral epicondyle of humerus

    • Which muscle's insertion is at the base of the second metacarpal bone?

  • Extensor carpi radialis longus (correct)
  • Flexor carpi ulnaris
  • Extensor carpi radialis brevis
  • Palmaris longus

    • What action is performed by the palmaris longus?

    <p>Flexion at wrist</p> Signup and view all the answers

    Which of the following muscles has an origin on the lateral epicondyle of the humerus?

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

    Which action is associated with the flexor carpi radialis?

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

    What is the primary role of the extensor carpi radialis longus?

    <p>Extension and abduction at wrist</p> Signup and view all the answers

    Which muscle is primarily responsible for wrist flexion and has no contribution in abduction?

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

    What is one of the primary actions of the subclavius muscle?

    <p>Protracts the scapula</p> Signup and view all the answers

    Which muscle is responsible for the upward rotation of the scapula?

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

    Where does the pectoralis major muscle originate?

    <p>Anterior surface of the medial half of the clavicle</p> Signup and view all the answers

    Which action is NOT associated with the trapezius muscle?

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

    Which of the following muscles can extend the neck?

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

    What is the function of the clavicular head of the pectoralis major?

    <p>Adducts and medially rotates the shoulder</p> Signup and view all the answers

    From where does the trapezius muscle originate?

    <p>Occipital bone and ligamentum nuchae</p> Signup and view all the answers

    Which of the following best describes the action of the sternocostal head of the pectoralis major when acting alone?

    <p>Adducts the humerus and draws the scapula anteriorly</p> Signup and view all the answers

    What is the primary role of the biceps brachii muscles?

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

    Where does the long head of the biceps brachii originate?

    <p>Supraglenoid tubercle</p> Signup and view all the answers

    What structure is associated with the radial groove?

    <p>Posterior surface of the humerus</p> Signup and view all the answers

    Which of the following movements does the biceps brachii contribute to?

    <p>Forearm supination</p> Signup and view all the answers

    Which anatomical part does the biceps brachii insert into?

    <p>Radial tuberosity of the radius</p> Signup and view all the answers

    What component lies adjacent to the olecranon process of the ulna?

    <p>Elbow joint capsule</p> Signup and view all the answers

    Which part of the biceps brachii is associated with the coracoid process?

    <p>Short head</p> Signup and view all the answers

    What type of movement is primarily facilitated by the biceps brachii during flexion?

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

    What is the primary action performed by the pronator at the radioulnar joints?

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

    From where does the supinator originate?

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

    What major movement does the supinator facilitate at the radioulnar joints?

    <p>Lateral rotation of the radius</p> Signup and view all the answers

    Which anatomical structure is associated with the action of pronation?

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

    In addition to medial rotation, what other motion occurs at the radioulnar joints during pronation?

    <p>Flexion at the elbow</p> Signup and view all the answers

    What is the primary action of the coracobrachialis muscle?

    <p>Adducts and flexes the shoulder</p> Signup and view all the answers

    Where does the coracobrachialis muscle originate?

    <p>Coracoid process</p> Signup and view all the answers

    Which area does the coracobrachialis insert into?

    <p>Medial shaft of the humerus</p> Signup and view all the answers

    What muscle is associated with the action of extending the arm?

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

    Which of the following structures is NOT part of the costal anatomy outlined?

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

    Which of the following actions is performed by the shoulder muscles as a group?

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

    The action of flexing the humerus is associated with which muscle?

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

    Which of the following muscles primarily contributes to shoulder abduction?

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

    Study Notes

    Muscles that Flex Fingers/Wrist

    • Flexor carpi radialis originates at the medial epicondyle of the humerus and inserts at the bases of the 2nd and 3rd metacarpal bones. It helps with flexion and abduction of the wrist.
    • Flexor carpi ulnaris originates at the medial epicondyle of the humerus, the adjacent medial surface of the olecranon, and the anteromedial portion of the ulna. It inserts at the pisiform, hamate, and the base of the fifth metacarpal bone. It assists in flexion and adduction at the wrist.
    • Palmaris longus originates at the medial epicondyle of the humerus and inserts at the palmar aponeurosis and the flexor retinaculum. It helps with wrist flexion.

    Muscles that Extend Wrist/Fingers

    • Extensor carpi radialis longus originates at the lateral supracondylar ridge of the humerus and inserts at the base of the second metacarpal bone. It aids in flexion and abduction at the wrist.
    • Extensor carpi radialis brevis originates at the lateral epicondyle of the humerus and inserts at the base of the third metacarpal bone. It helps with flexion and abduction at the wrist.

    Muscles that Move the Arm

    • Coracobrachialis originates at the coracoid process of the scapula and inserts at the medial margin of the shaft of the humerus. It assists with adduction and flexion of the shoulder.
    • Pectoralis major originates at the clavicle and sternum and inserts at the lateral lip of the intertubular groove of the humerus. It helps with adduction, medial rotation, and drawing the scapula anteriorly and inferiorly.
    • Biceps brachii (long head) originates at the supraglenoid tubercle of the scapula and inserts at the radial tuberosity of the radius. It assists with flexion, supination of the forearm, and medial rotation of the humerus.
    • Biceps brachii (short head) originates at the coracoid process of the scapula and inserts at the radial tuberosity of the radius. It helps with flexion and supination of the forearm.
    • Pronator teres originates at the coronoid process of the ulna and the lateral epicondyle of the humerus and inserts at the anterolateral surface of the radius, distal to the radial tuberosity. It assists with pronation of the forearm and flexion at the elbow.
    • Supinator originates at the lateral epicondyle of the humerus, the ridge near the radial notch of the ulna, and the radial tuberosity. It assists with supination of the forearm and lateral rotation of the radius.

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    Description

    This quiz covers the muscles responsible for flexing and extending the wrist and fingers. Learn about the origins, insertions, and functions of key muscles such as the flexor carpi radialis and extensor carpi radialis. Test your knowledge on the anatomy of these important muscle groups.

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