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Wrist/Hand Extensors

Extensors

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