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Questions and Answers
What is the action of the flexor digitorum superficialis?
What is the action of the flexor digitorum superficialis?
- Finger extension
- Wrist flexion (correct)
- Forearm pronation
- Elbow extension
Where does the flexor pollicis longus originate?
Where does the flexor pollicis longus originate?
- Medial epicondyle of the humerus
- Interosseous membrane
- Radius (correct)
- Ulna
What is the insertion point of the extensor carpi radialis longus?
What is the insertion point of the extensor carpi radialis longus?
- Proximal phalanx of digit 2
- Metacarpals (correct)
- Distal phalanges of digit 2-5
- Middle phalanges of digit 3-5
Which muscle is responsible for forearm supination?
Which muscle is responsible for forearm supination?
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Where does the extensor indicis originate?
Where does the extensor indicis originate?
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What is the insertion point of the flexor carpi ulnaris?
What is the insertion point of the flexor carpi ulnaris?
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Which muscle is responsible for wrist expansion?
Which muscle is responsible for wrist expansion?
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What is the insertion point of the extensor carpi radialis brevis?
What is the insertion point of the extensor carpi radialis brevis?
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Study Notes
Flexor Digitorum Superficialis
- Flexes the middle phalanges of the four fingers (index, middle, ring, and little)
Flexor Pollicis Longus
- Originates from the anterior surface of the radius and the interosseous membrane
Extensor Carpi Radialis Longus
- Inserts on the base of the second metacarpal bone
Forearm Supination
- Supinator muscle is primarily responsible for supination of the forearm
Extensor Indicis
- Originates from the posterior surface of the ulna, distal to the extensor digitorum
Flexor Carpi Ulnaris
- Inserts on the pisiform bone and the hook of the hamate bone
Wrist Expansion
- Extensor carpi radialis longus and brevis muscles along with other extensor muscles of the wrist are responsible for wrist expansion
Extensor Carpi Radialis Brevis
- Inserts on the base of the third metacarpal bone
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