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Opponens Digiti Minimi
- O: flexor retinaculum hook of hamate
- I: medial border of 5thmetacarpal
- N: ulnar nerve C8,T1
- A: opposes & medially rotates little finger
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Abductor Digiti Minimi
- O: pisiformpisohamate ligamentflexor carpi ulnaris tendon
- I: medial aspect base of proximal phalanx of 5th finger
- N: ulnar nerve C8,T1
- A: abducts the little finger
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Flexor Digiti Minimi Brevis
- O: flexor retinaculumhook of hamate
- I: medial aspect base of proximal phalanx of 5th finger
- N: ulnar nerve C8,T1
- A: flexes little finger at MCP articulation
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Flexor Pollicis Brevis
- O: superficial head – flexor retinaculum, trapezium, scaphoid; deep head – trapezoid, capitate, palmar ligament
- I: radial side base of proximal phalanx of thumb
- N: median nerve C8,T1(ulnar nerve C8,T1 part of it possibly)
- A: pulls thumb across palm of handflexes thumb
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Abductor Pollicis Brevis
- O: flexor retinaculumscaphoidtrapezium
- I: radial side base of proximal phalanx of thumb
- N: median nerve C8,T1
- A: abduct & assists with opposition
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Adductor Pollicis
- O: oblique head – ant. surface base of 2nd and 3rd metacarpalscapitate & adjacent bones; transverse head – ant. surface of 3rd metacarpal
- I: medial side base of proximal phalanx of thumb
- N: ulnar nerve C8,T1
- A: adducts thumb
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Opponens Pollicis
- O: flexor retinaculumtrapezium
- I: lateral side of shaft of 1st metacarpal
- N: median nerve C8,T1
- A: medially rotates thumb, draws thumb into opposition
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Lumbricals
- O: 1st & 2nd – radial side palmar surface of flexor digitorum profundus (FDP) tendons; 3rd – adj sides of FDP tendons of 3rd & 4th digits; 4th – adjacent sides of FDP tendons of 4th & 5th digits
- I: lateral sides of dorsal extension expansion of digits 2 - 5
- N: 1st & 2nd – median nerve C8,T13rd & 4th – ulnar nerve C8,T1
- A: flexes MCP (main ones for this)extends IP
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Palmar Interossei
- O: 1st – ulnar side palmar asp. of 2nd metacarpal; 2nd – radial side palmar aspect 4th metacarpal; 3rd – radial side palmar aspect 5th metacarpal
- I: all insert into DorExExp of digits; 1st – ulnar side base of proximal phalanx of 2nd digit; 2nd – radial side base of proximal phalanx of 4th digit; 3rd – radial side base of proximal phalanx of 5th digit
- N: ulnar nerve C8,T1
- A: adduct towards 3rd fingeralso help w/ extension of IPs and flexing MCP joints
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Dorsal Interossei
- O: 1st – adjacent sides of 1st and 2nd metacarpals; 2nd – adjacent sides of 2nd and 3rd metacarpals; 3rd – adjacent sides of 3rd and 4th metacarpals; 4th – adjacent sides of 4th and 5th metacarpals
- I: all insert into DorDigExp of either 2nd, 3rd or 4th fingers; 1st – rad. asp. base of proximal phalanx of 2nd finger;2nd & 3rd – rad & uln asp (resp) of base of prox. phalanx of 3rd finger; 4th – ulnar aspect base of prox. phalanx of 4th finger
- N: ulnar nerve C8,T1
- A: abduct the digits, assists with flexing MCP joints, extends IPs
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Palmaris Brevis
- O: flexor retinaculum; palmar aponeurosis
- I: skin of palm
- N: ulnar nerve C8,T1
- A: tightens skin on palm
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