Updated: 12/31/2021

Palmar interossei

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                        Summary
                    
                        Palmar interossei (3 muscles)
                    
                        Origin
                    
                        Palmar surfaces of 2nd, 4th and 5th metacarpals (3 unipennate muscles)
                    
                        Insertion
                    
                        Extensor expansions of digits and bases of proximal phalanges of digits 2, 4 and 5
                    
                        Action
                    
                        Adduct digits toward axial line and assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints
                    
                        Innervation
                    
                        Deep branch of ulnar nerve (C8, T1)
                    
                        Arterial supply
                    
                        Palmar metacarpal arteries

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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⎪Palmar interossei

Anatomy
- Palmar interossei

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Palmar interossei (3 muscles)
Origin	Palmar surfaces of 2nd, 4th and 5th metacarpals (3 unipennate muscles)
Insertion	Extensor expansions of digits and bases of proximal phalanges of digits 2, 4 and 5
Action	Adduct digits toward axial line and assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints
Innervation	Deep branch of ulnar nerve (C8, T1)
Arterial supply	Palmar metacarpal arteries