Extensors
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Action of Flexor Pollicis Longus | Flexes the thumb, Assists in flexing the thumb
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| Origin of Flexor Pollicis Longus | Anterior surface of the radius, deep to flexors
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| Insertion of Flexor Pollicis Longus | Distal phalange of thumb
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| Nerve that innervatesthe Flexor Pollicis Longus | Median
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| Action of Extensor Indicis | Extension of the index finger at metacarpophalangeal joint, weak wrist extension
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| Origin of Extensor Indicis | Middle to distal 1/3 of the posterior ulna
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| Insertion Of Extensor Indicis | Base of middle and distal phalanxes of 2nd phalange (dorsal surface)
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| Nerve innervates Extensor Indicis | Radial
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| Action of Extensor digiti minimi | Extension of little finger at the matacarpophalangeal joint
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| Origin of Extensor digiti minimi | Lateral epicondyle of the humerus
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| Insertion Extensor digiti minimi | Base of the middle and distal phalanxes of the 5th phalange (dorsal surface)
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| Nerve that innervates Extensor digiti minimi | Radial
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| Action of Extensor Pollicis Longus | Extension of the thumb, Extension of the wrist
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| Origin of Extensor Pollicis Longus | Posterior lateral surface of lower middle ulna
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| Insertion of Extensor Pollicis Longus | Base of the distal phalanx of the thumb (dorsal surface)
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| Nerve that innervates Extensor Pollicis Longus | Radial
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| Action of Extensor Pollicis Brevis | Extension of the thumb, weak extension of the wrist
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| Origin of Extensor Pollicis Brevis | Posterior surface of the lower middle radius
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| Insertion of Extensor Pollicis Brevis | Base of the proximal phalanx of the thumb (dorsal surface)
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| Nerve innervates Extensor Pollicis Brevis | Radial
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| Action of Abductor Pollicis Longus | Abducts the thumb, Extends the thumb, abducts the wrist
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| Origin of Abductor Pollicis Longus | Posterior aspect of the radius and midshaft of the ulna, deep to the extensors
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| Insertion of Abductor Pollicis Longus | Base of 1st metacarpal
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| Nerve innervates Abductor Pollicis Longus | Radial
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| Action of Extensor Carpi Radialis Longus | Extend the wrist, abduct the wrist, assist in flexion of elbow
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| Origin of Extensor Carpi Radialis Longus | Lateral supracondylar ridge of humerus
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| Insertion of Extensor Carpi Radialis Longus | Base of 2nd metacarpal
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| Nerve that innervates Extensor Carpi Radialis Longus | Radial
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| Action of Extensor Carpi Radialis brevis | Extend/abduct the wrist, assist in flexion of elbow
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| Origin of Extensor Carpi Radialis brevis | Lateral supracondylar ridge of humerus
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| Insertion of Extensor Carpi Radialis brevis | Base of 3rd metacarpal
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| Nerve innervates Extensor Carpi Radialis brevis | Radial
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| Action of Extensor Digitorum | Extends the 2nd through 5th fingers, assists in extension of the wrist
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| Origin of Extensor Digitorum | Common extensor tendon from lateral epicondyle of humerus
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| Insertion of Extensor Digitorum | Middle and distal phalanges of 2nd through 5th Fingers
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| Nerve that innervates Extensor Digitorum | Radial
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| Action of Extensor Carpi Ulnaris | extends/adducts the wrist
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| Origin of Extensor Carpi Ulnaris | common extensor tendon from lateral epicondyle
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| Insertion of Extensor Carpi Ulnaris | base of 5th metacarpal
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| Nerve innervates Extensor Carpi Ulnaris | Radial
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