Forearm and Hand Muscles Anatomy Quiz
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Questions and Answers

Which muscle is responsible for the characteristic relief of the shoulder?

  • Pectoralis major
  • Deltoid muscle (correct)
  • Teres major
  • Latissimus dorsi

    • Which part of the deltoid muscle allows flexion and internal rotation of the arm?

  • Pars spinalis
  • Pars acromialis
  • Tuberositas deltoidea
  • Pars clavicularis (correct)

    • What happens in axillary nerve palsy with respect to the deltoid muscle?

  • Pars acromialis becomes more active
  • Characteristic bulge of the shoulder disappears due to muscle atrophy (correct)
  • Abduction movement of the arm is enhanced
  • Skin sensation is heightened in the upper part of the outer surface of the arm

    • What is the main function of the deltoid muscle?

    <p>Main abductor muscle of the arm</p> Signup and view all the answers

    What is the insertion point of the common tendon of the three parts of the deltoid muscle?

    <p>Tuberositas deltoidea (deltoid tuberosity) on the body of the humerus</p> Signup and view all the answers

    What does the pars acromialis of the deltoid muscle allow?

    <p>Abduction of the arm from 15° to 90°</p> Signup and view all the answers

    Which nerve stimulates the first and second lumbrical muscles?

    <p>N. medianus</p> Signup and view all the answers

    What is the function of the palmar interosseous muscles?

    <p>Adduct the 2nd, 4th and 5th fingers</p> Signup and view all the answers

    Where do the lumbrical muscles start from?

    <p>Tendons of the M. flexor digitorum profundus</p> Signup and view all the answers

    What is the termination point of the palmar interosseous muscles?

    <p>Base of the proximal phalanx and dorsal digital expansion</p> Signup and view all the answers

    Which nerve stimulates the third and fourth lumbrical muscles?

    <p>R. profundus</p> Signup and view all the answers

    What is the function of the dorsal interosseous muscles?

    <p>Abduct the fingers</p> Signup and view all the answers

    Which muscle is the main and only extensor muscle of the forearm?

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

    Which muscle initiates the first 15° of arm abduction and is part of the rotator cuff muscles?

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

    Which muscle is the main flexor muscle of the forearm, always active during forearm flexion?

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

    Which muscle allows adduction, internal rotation, and extension of the arm, and forms the posterior wall of the axillary fossa along with latissimus dorsi?

    <p>Teres major</p> Signup and view all the answers

    Which muscle is the main muscle for internal rotation of the arm and is the only muscle that inserts into the tuberculum minus of the humerus?

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

    Which muscle allows some flexion and adduction of the arm and is located on the upper inner part of the arm?

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

    Which muscle is responsible for medial and external rotation of the arm?

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

    Which nerve stimulates the flexor carpi ulnaris muscle?

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

    Which muscle flexes the 2nd-5th fingers and weakly flexes the forearm and wrist?

    <p>Flexor digitorum superficialis</p> Signup and view all the answers

    Which muscle allows flexion and radial deviation of the hand?

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

    Which muscle is the main pronator muscle of the forearm?

    <p>Pronator quadratus</p> Signup and view all the answers

    Which muscle causes flexion of the hand and stretches the aponeurosis palmaris?

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

    Which muscle is responsible for external rotation of the radius and works with the biceps brachii in strong or fast supination?

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

    Which muscle causes abduction and extension of the thumb?

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

    What causes lateral epicondylitis, also known as tennis elbow?

    <p>Repetitive use of the extensor muscles of the forearm</p> Signup and view all the answers

    Which nerve stimulates the tenar muscles, including abductor pollicis brevis, adductor pollicis, flexor pollicis brevis, and opponens pollicis?

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

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

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

    Which muscle assists in the extension of the index finger and hand?

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

    Which part of the deltoid muscle allows abduction of the arm from 15° to 90°?

    <p>Pars acromialis</p> Signup and view all the answers

    What is the main abductor muscle of the arm?

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

    Which nerve stimulates the deltoid muscle?

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

    What happens in axillary nerve palsy with respect to the deltoid muscle?

    <p>Impaired abduction movement of the arm</p> Signup and view all the answers

    What is the insertion point of the common tendon of the three parts of the deltoid muscle?

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

    Which muscle holds the humeral head in the glenoid cavity during arm movements?

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

    Which muscle is responsible for both turning the radius inward and assisting in forearm flexion?

    <p>Pronator teres</p> Signup and view all the answers

    Which nerve stimulates the flexor carpi ulnaris muscle?

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

    Which muscle is the main and only extensor muscle of the forearm?

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

    Which muscle causes flexion and ulnar deviation of the hand?

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

    Which muscle is the largest forearm muscle and flexes the distal phalanges of the 2nd-5th fingers?

    <p>Flexor digitorum profundus</p> Signup and view all the answers

    Which muscle allows flexion and radial deviation of the hand?

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

    Which muscle is not part of the rotator cuff?

    <p>Teres major</p> Signup and view all the answers

    Which muscle is the main and only extensor muscle of the forearm?

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

    Which muscle is responsible for forearm supination, flexion, and arm flexion?

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

    Which muscle is the main flexor muscle of the forearm, always active during forearm flexion?

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

    Which muscle allows some flexion and adduction of the arm and is located on the upper inner part of the arm?

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

    Which muscle is the main muscle for internal rotation of the arm and is the only muscle that inserts into the tuberculum minus of the humerus?

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

    Which muscle is responsible for the characteristic relief of the shoulder?

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

    What is the insertion point of the common tendon of the three parts of the deltoid muscle?

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

    Which muscle allows some flexion and adduction of the arm and is located on the upper inner part of the arm?

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

    What is the function of the dorsal interosseous muscles?

    <p>Abduct the fingers</p> Signup and view all the answers

    Which muscle allows adduction, internal rotation, and extension of the arm, and forms the posterior wall of the axillary fossa along with latissimus dorsi?

    <p>Teres major muscle</p> Signup and view all the answers

    Which muscle is responsible for external rotation of the radius and works with the biceps brachii in strong or fast supination?

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

    Which nerve stimulates the lumbrical muscles?

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

    What is the function of the palmar interosseous muscles?

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

    What is the function of the dorsal interosseous muscles?

    <p>Abduction of the fingers</p> Signup and view all the answers

    Which muscle is responsible for abducting the 2nd, 4th, and 5th fingers?

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

    Where do the lumbrical muscles terminate?

    <p>Dorsal digital expansion on the radial side of the proximal phalanx</p> Signup and view all the answers

    What is the main function of the lumbrical muscles?

    <p>Flexion of the metacarpophalangeal joints and extension of the interphalangeal joints</p> Signup and view all the answers

    Which muscle is responsible for the characteristic relief of the shoulder?

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

    What is the insertion point of the common tendon of the three parts of the deltoid muscle?

    <p>Tuberositas deltoidea (deltoid tuberosity) on the body of the humerus</p> Signup and view all the answers

    Which nerve stimulates the deltoid muscle?

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

    Which muscle is the main and only extensor muscle of the forearm?

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

    Where do the lumbrical muscles start from?

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

    What is the function of the palmar interosseous muscles?

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

    Which muscle is primarily responsible for forearm supination, flexion, and arm flexion?

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

    Which muscle is the main flexor muscle of the forearm, always active during forearm flexion?

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

    Which muscle is the main and only extensor muscle of the forearm?

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

    Which muscle is the main abductor muscle of the arm?

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

    Which muscle is the main pronator muscle of the forearm?

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

    Which muscle allows some flexion and adduction of the arm and is located on the upper inner part of the arm?

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

    Which muscle is responsible for forearm supination, flexion, and arm flexion?

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

    Which muscle is the main pronator muscle of the forearm?

    <p>Pronator quadratus</p> Signup and view all the answers

    Which muscle allows flexion and ulnar deviation of the hand?

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

    Which muscle is responsible for medial and external rotation of the arm?

    <p>Teres minor</p> Signup and view all the answers

    Which muscle flexes the 2nd-5th fingers and weakly flexes the forearm and wrist?

    <p>Flexor digitorum superficialis</p> Signup and view all the answers

    Which muscle is the main and only extensor muscle of the forearm?

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

    Which nerve stimulates the third and fourth lumbrical muscles?

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

    What is the function of the lumbrical muscles?

    <p>Cause flexion of the proximal phalanges at the metacarpophalangeal joints and extension of the other phalanges at the interphalangeal joints</p> Signup and view all the answers

    Where do the lumbrical muscles originate from?

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

    What is the function of the palmar interossei muscles?

    <p>Adduct the fingers</p> Signup and view all the answers

    What is the function of the dorsal interossei muscles?

    <p>Adduct the fingers</p> Signup and view all the answers

    Which nerve stimulates the first and second lumbrical muscles?

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

    Which muscle is responsible for external rotation of the radius and works with the biceps brachii in strong or fast supination?

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

    Which muscle is responsible for lateral epicondylitis, also known as tennis elbow?

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

    Which muscle is stimulated by the ulnar nerve and includes abductor digiti minimi, flexor digiti minimi, and opponens digiti minimi?

    <p>Hypothenar muscles</p> Signup and view all the answers

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

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

    Which muscle assists in the extension of the index finger and hand?

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

    Which muscle is responsible for external rotation of the radius and works with the biceps brachii in strong or fast supination?

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

    Study Notes

    Anatomy of the Forearm and Hand Muscles

    • Continuous and forceful movements cause inflammation of the medial epicondyle, leading to pain on the medial side of the elbow
    • Deep muscles of the forearm include abductor pollicis longus and extensor pollicis longus, which cause abduction and extension of the thumb
    • Extensor digitorum muscle extends the 2nd-5th phalanges, while extensor carpi ulnaris causes extension and adduction of the hand
    • Anconeus muscle helps in the extension of the forearm and is stimulated by the radial nerve
    • Supinator muscle is responsible for external rotation of the radius and works with the biceps brachii in strong or fast supination
    • Lateral epicondylitis (tennis elbow) is caused by repetitive use of the extensor muscles of the forearm or vigorous supination-pronation movements
    • Carpal tunnel syndrome results from compression of the median nerve in the carpal tunnel, leading to pain and weakening of the tenar muscles' function
    • Tenar muscles, stimulated by the median nerve, include abductor pollicis brevis, adductor pollicis, flexor pollicis brevis, and opponens pollicis
    • Hypothenar muscles, stimulated by the ulnar nerve, include abductor digiti minimi, flexor digiti minimi, and opponens digiti minimi
    • The deep layer flexor muscles include adductor pollicis, abductor pollicis brevis, flexor pollicis brevis, and opponens pollicis
    • Extensor indicis muscle assists in the extension of the index finger and hand
    • Anatomical snuffbox, located on the back of the hand, is defined by the tendons of extensor pollicis longus and extensor pollicis brevis and the retinaculum musculorum extensorum

    Anatomy of the Forearm and Hand Muscles

    • Continuous and forceful movements cause inflammation of the medial epicondyle, leading to pain on the medial side of the elbow
    • Deep muscles of the forearm include abductor pollicis longus and extensor pollicis longus, which cause abduction and extension of the thumb
    • Extensor digitorum muscle extends the 2nd-5th phalanges, while extensor carpi ulnaris causes extension and adduction of the hand
    • Anconeus muscle helps in the extension of the forearm and is stimulated by the radial nerve
    • Supinator muscle is responsible for external rotation of the radius and works with the biceps brachii in strong or fast supination
    • Lateral epicondylitis (tennis elbow) is caused by repetitive use of the extensor muscles of the forearm or vigorous supination-pronation movements
    • Carpal tunnel syndrome results from compression of the median nerve in the carpal tunnel, leading to pain and weakening of the tenar muscles' function
    • Tenar muscles, stimulated by the median nerve, include abductor pollicis brevis, adductor pollicis, flexor pollicis brevis, and opponens pollicis
    • Hypothenar muscles, stimulated by the ulnar nerve, include abductor digiti minimi, flexor digiti minimi, and opponens digiti minimi
    • The deep layer flexor muscles include adductor pollicis, abductor pollicis brevis, flexor pollicis brevis, and opponens pollicis
    • Extensor indicis muscle assists in the extension of the index finger and hand
    • Anatomical snuffbox, located on the back of the hand, is defined by the tendons of extensor pollicis longus and extensor pollicis brevis and the retinaculum musculorum extensorum

    Anatomy of the Forearm and Hand Muscles

    • Continuous and forceful movements cause inflammation of the medial epicondyle, leading to pain on the medial side of the elbow
    • Deep muscles of the forearm include abductor pollicis longus and extensor pollicis longus, which cause abduction and extension of the thumb
    • Extensor digitorum muscle extends the 2nd-5th phalanges, while extensor carpi ulnaris causes extension and adduction of the hand
    • Anconeus muscle helps in the extension of the forearm and is stimulated by the radial nerve
    • Supinator muscle is responsible for external rotation of the radius and works with the biceps brachii in strong or fast supination
    • Lateral epicondylitis (tennis elbow) is caused by repetitive use of the extensor muscles of the forearm or vigorous supination-pronation movements
    • Carpal tunnel syndrome results from compression of the median nerve in the carpal tunnel, leading to pain and weakening of the tenar muscles' function
    • Tenar muscles, stimulated by the median nerve, include abductor pollicis brevis, adductor pollicis, flexor pollicis brevis, and opponens pollicis
    • Hypothenar muscles, stimulated by the ulnar nerve, include abductor digiti minimi, flexor digiti minimi, and opponens digiti minimi
    • The deep layer flexor muscles include adductor pollicis, abductor pollicis brevis, flexor pollicis brevis, and opponens pollicis
    • Extensor indicis muscle assists in the extension of the index finger and hand
    • Anatomical snuffbox, located on the back of the hand, is defined by the tendons of extensor pollicis longus and extensor pollicis brevis and the retinaculum musculorum extensorum

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    Description

    Test your knowledge of the forearm and hand muscles with this anatomy quiz. Explore the functions and characteristics of key muscles, their associated nerves, and common conditions such as tennis elbow and carpal tunnel syndrome.

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