Updated: 1/1/2022

Extensor Pollicis Longus

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                        Summary
                    
                        Extensor Pollicis Longus
                    
                        Origin
                    
                        Posterior surface of middle 1/3 of ulna and interosseous membrane
                    
                        Insertion
                    
                        Base of distal phalanx of thumb
                    
                        Action
                    
                        Extends distal phalanx of thumb at metacarpophalangeal and interphalangeal joints
                    
                        Innervation
                    
                        Posterior interosseous nerve (C7, C8)
                    
                        Arterial supply
                    
                        Posterior interosseous artery

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1 of 5

Action	Numeric Key	Letter Key	Function Key
Show Bullets		S	Enter (frontside only)
20%	1	N
40%	2	H
60%	3	F	Enter (backside only)
80%	4	E
100%	5	M
Toss	0	T

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Anatomy⎪Extensor Pollicis Longus

Anatomy
- Extensor Pollicis Longus

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Extensor Pollicis Longus
Origin	Posterior surface of middle 1/3 of ulna and interosseous membrane
Insertion	Base of distal phalanx of thumb
Action	Extends distal phalanx of thumb at metacarpophalangeal and interphalangeal joints
Innervation	Posterior interosseous nerve (C7, C8)
Arterial supply	Posterior interosseous artery