Intrinsic muscles of the hand

abductor pollicis brevis

thenar muscle

O: flexor retinaculum, trapezium, scaphoid

I: proximal phalanx of digit 1

A: abduction and aids in opposition

Inn: recurrent branch of the median n

flexor pollicis brevis

thenar muscle

O: flexor retinaculum, trapezium

I: proximal phalanx of digit 1

A: flexion and aids in opposition

Inn: recurrent branch of the median n

opponens pollicis

thenar muscle

O: flexor retinaculum and trapezium

I: lateral side of 1st metacarpal

A: opposition

Inn: recurrent branch of median n

adductor pollicis

deep to the thenar muscles

O: 2nd and 3rd metacarpal bones

I: medial side of the proximal phalanz of digit 1

A: adducts thumb, assists in opposition

Inn: ulnar n

abductor digiti minimi

hypothenar muscle

O: pisiform

I: medial side of proximal phalanx of digit 5

A: abduction of digit 5

Inn: ulnar n

flexor digiti minimi

hypothenar muscle

O: hamate and flexor retinaculum

I: medial side of proximal phalanx of digit 5

A: flexion of MCP, proximal phalanx of digit 5

Inn: ulnar n

opponens digiti minimi

hypothenar muscles

O: hamate and flexor retinaculum

I: medial border of the 5th metacarpal

A: opposition of 5th digit to thumb

Inn: ulnar n

lumbricals

deep muscles of the hand

O: tendons of flexor digitorum profundus

I: lateral sides of extensor ecpansions of digits 2-5

A: flexion of MCP joints, extension of IP joints of digits 2-5

Inn: first 2 lumbricals by median n, 3rd and 4th by ulnar n

dorsal interossei

deep muscle of the hand

O: adjacent sides of 2 metacarpal bones

I: extensor expansion and base of digits 2-4

A: flexion of MCP joints, extend IP joints, abduct digits 2-4

Inn: ulnar n

palmar interossei

deep muscle of hand

O: palmar surface of 2nd, 4th, 5th metacarpal

I: extensor expansions of digits 2,4,5

A: flex MCP, extend IP, adduct digits 2,4,5

Inn: ulnar n

palmar aponeurosis

deep muscle of the hand

O: palmaris longus

I: digits 2-5

A: protects deeper structures

Inn: ulnar n