Hand Muscle OIAs

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 (draws anterior and rotates medially)

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

Opponents Digiti minimi (Origin)

hook of hamate

Opponens digiti minimi (Insertion)

palmar surface of 5th metacarpal

Opponens digiti minimi (Action)

Opposition of 5th metacarpal (draws anterior and rotates laterally)

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 & 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, & 5

Palmar interosseous (Insertion)

bases of proximal phalanges 2, 4, & 5, Extensor expansion of digits 2, 4, & 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