Updated: 12/31/2021

Dorsal interossei

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                        Summary
                    
                        Dorsal interossei (4 muscles)
                    
                        Origin
                    
                        Adjacent sides of two metacarpals (4 bipennate muscles)
                    
                        Insertion
                    
                        Extensor expansions and bases of proximal phalanges of digits 2 - 4 
                    
                        Action
                    
                        Abduct digits from axial line and act with lumbricals to flex metacarpophalangeal joints and extend interphalangeal joints
                    
                        Innervation
                    
                        Deep branch of ulnar nerve (C8, T1)
                    
                        Arterial Supply
                    
                        Dorsal and 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⎪Dorsal interossei

Anatomy
- Dorsal interossei

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Dorsal interossei (4 muscles)
Origin	Adjacent sides of two metacarpals (4 bipennate muscles)
Insertion	Extensor expansions and bases of proximal phalanges of digits 2 - 4
Action	Abduct digits from axial line and act with lumbricals to flex metacarpophalangeal joints and extend interphalangeal joints
Innervation	Deep branch of ulnar nerve (C8, T1)
Arterial Supply	Dorsal and palmar metacarpal arteries