Podcast
Questions and Answers
What is the primary action of the flexor carpi radialis?
What is the primary action of the flexor carpi radialis?
Which muscle originates from the medial epicondyle of the humerus and tenses the palmar aponeurosis?
Which muscle originates from the medial epicondyle of the humerus and tenses the palmar aponeurosis?
What is the insertion point of the pronator teres muscle?
What is the insertion point of the pronator teres muscle?
Which muscle flexes the middle phalanges at the proximal interphalangeal joints of the middle four digits?
Which muscle flexes the middle phalanges at the proximal interphalangeal joints of the middle four digits?
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What action is primarily performed by the flexor carpi ulnaris?
What action is primarily performed by the flexor carpi ulnaris?
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What muscles flex the distal phalanges at the metacarpophalangeal joints of the 4th and 5th digits?
What muscles flex the distal phalanges at the metacarpophalangeal joints of the 4th and 5th digits?
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Where does the flexor pollicis longus originate?
Where does the flexor pollicis longus originate?
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Which muscle's action includes both extension and abduction of the hand?
Which muscle's action includes both extension and abduction of the hand?
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What is the primary action of the extensor digitorum?
What is the primary action of the extensor digitorum?
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Which muscle specifically extends the pinky finger?
Which muscle specifically extends the pinky finger?
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What is the insertion point for the brachioradialis?
What is the insertion point for the brachioradialis?
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Which muscle's action is to supinate the forearm?
Which muscle's action is to supinate the forearm?
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Which muscle originates from the lateral epicondyle of the humerus and extends the hand?
Which muscle originates from the lateral epicondyle of the humerus and extends the hand?
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Where does the extensor pollicis longus insert?
Where does the extensor pollicis longus insert?
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What is the action of the extensor carpi ulnaris?
What is the action of the extensor carpi ulnaris?
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Study Notes
Muscle Origins, Insertions, and Actions
- Pronator Teres: Originates at the coronoid process and medial epicondyle of the humerus; inserts at the middle of the lateral surface of the radius; action: pronates and flexes the arm at the elbow.
- Flexor Carpi Radialis: Originates at the medial epicondyle of the humerus; inserts at the base of the second metacarpal; action: flexes the hand and abducts it.
- Palmaris Longus: Originates at the medial epicondyle of the humerus; inserts at the flexor retinaculum; action: flexes the hand and tenses the palmar aponeurosis.
- Flexor Carpi Ulnaris: Originates at the medial epicondyle; inserts at the pisiform/hook of hamate, 5th metacarpal; action: flexes and adducts the hand.
- Flexor Digitorum Superficialis: Originates at the medial epicondyle; inserts at the shafts of the middle four phalanges of medial four digits; action: flexes middle phalanges at proximal interphalangeal joints, also flexes proximal phalanges at metacarpophalangeal joints.
- Flexor Digitorum Profundus: Originates at the proximal ¼ of medial and anterior ulna and interosseus membrane; inserts at the bases of distal phalanges of 4th/5th digits; action: flexes distal phalanges.
- Flexor Policies Longus: Originates at anterior surface of radius and interosseus membrane; inserts at base of distal phalanx of thumb; action: flexes thumb.
- Brachioradialis: Originates at proximal ¼ of lateral supracondylar ridge of the humerus; inserts at lateral surface of distal end of radius proximal to styloid; action: elbow flexion to neutral position.
- Extensor Carpi Radialis Longus: Originates at lateral supracondylar ridge of humerus; inserts at dorsal aspect of base of 2nd metacarpal; action: extends and abducts hand.
- Extensor Carpi Radialis Brevis: Originates at lateral supracondylar ridge of humerus; inserts at dorsal aspect of base of 3rd metacarpal; action: extends and abducts hand.
- Extensor Carpi Ulnaris: Originates at lateral epicondyle of humerus; inserts at dorsal aspect of base of the 5th metacarpal; action: extends and adducts hand.
- Extensor Digitorum: Originates at lateral epicondyle; inserts at the extensor expansion of medial 4 digits; action: extends medial 4 digits.
- Extensor Digiti Minimi: Originates at lateral epicondyle of humerus; inserts at the extensor expansion of the 5th digit; action; extends pinky.
- Supinator: Originates at lateral condyle of humerus and lateral side of the radius; inserts at lateral surface of proximal 3rd of the radius; action: supinates forearm.
- Extensor Policies Longus: Originates at posterior surface of the middle third of the ulna and interosseous membrane; inserts at dorsal aspect of distal phalanx of the thumb; action: extends thumb.
- Extensor Policies Brevis: Originates at posterior surface of the distal 3rd of the radius; inserts at dorsal aspect of proximal phalanx of the thumb; action: extends thumb.
- Extensor Indices: Originates at posterior surface of the distal 3rd of the ulna and interosseous membrane; inserts at extensor expansion of second digit; action: extends pointer finger.
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Description
Test your knowledge on the origins, insertions, and actions of various muscles including the Pronator Teres, Flexor Carpi Radialis, and others. This quiz will help reinforce your understanding of muscular anatomy and functionality.
