Hand Muscle OIA

Abductor Pollicis Brevis Origin

scaphoid tubercle, trapezium tubercle

Abductor Pollicis Brevis Insertion

base of proximal phalanx of thumb

Abductor Pollicis Brevis Action

abducts thumb

Flexor Pollicis Brevis Origin

flexor retinaculum tubercle of trapezium, trapezoid and capitate bones

Flexor Pollicis Brevis Insertion

lateral base of proximal phalanx of thumb

Flexor Pollicis Brevis Action

flexes proximal phalanx of thumb

Opponens Pollicis Origin

trapezium tubercle

Opponens Pollicis Insertion

lateral surface of 1st metacarpal

Opponens Pollicis Action

opposition of 1st metacarpal

Abductor Digiti Minimi Origin

pisiform bone

Abductor Digiti Minimi Insertion

medial base of proximal phalanx of 5th digit

Abductor Digiti Minimi Action

abducts 5th digit

Flexor Digiti Minimi Brevis Origin

hook of hamate

Flexor Digiti Minimi Brevis Insertion

medial base of proximal phalanx of 5th digit

Flexor Digiti Minimi Brevis Action

flexes proximal phalanx of 5th digit

Opponens Digiti Minimi Origin

hook of hamate

Opponens Digiti Minimi Insertion

palmar surface of 5th metacarpal

Opponens Digiti Minimi Action

opposition of 5th metacarpal

Lumbrical Origin

tendons of flexor digitorum profundus

Lumbrical Insertion

lateral sides of extensor expansion of digits 2-5

Lumbrical Action

extends interphalangeal joints, flexes metacarpophalangeal joints

Adductor Pollicis Origin

anterior bases of 2nd and 3rd metacarpals, capitate, anterior surface of 3rd metacarpal

Adductor Pollicis Insertion

base of proximal phalanx of thumb

Adductor Pollicis Action

adducts thumb

Palmar Interosseous Origin

palmer surfaces of metacarpals 2,4 and 5

Palmar Interosseous Insertion

bases of proximal phalanges 2,4, and 5, extensor expansion of digits 2,4, and 5

Palmar Interosseous Action

adducts digits, extends interphalangeal joints, flexes metacarpophalangeal joints

Dorsal Interosseous Origin

facing surfaces of adjacent metacarpal bones

Dorsal Interosseous Insertion

base of proximal phalanges, extensor expansion of digits 2-4

Dorsal Interosseous Action

abducts digits, extends interphalangeal joints, flexes metacarpophalangeal joints