O: Flexor retinaculum (and trapezium)

I: Radial side of proximal phalanx of thumb

A: Abduction, flexion of proximal phalanx extension of distal phalanx

N: Median recurrent

O: Flexor retinaculum (and trapezium)

I: Radial side of flexor surface of proximal phalanx of thumb

A: Flexion of proximal phalanx thumb

N: Median recurrent

O: Flexor retinaculum (and trapezium)

I: Radial side of first metacarpal

A: Opposition of thumb

N: Median recurrent

O: TransH: 3rd metacarpal

    ObliqH: bases of metacarpals 1-3

I: Ulnar side of base of proximal phalanx of thumb

A: Adduction, flexion of proximal phalanx of thumb

N: Deep ulnar n.

O: Palmar aponeurosis (ulnar border)

I: Skin of ulnar border of palm; pisiform

A: Tightening of hypothena eminence

N: Superficial ulnar n.

O: Pisiform

I: Medial side of base of proximal phalanx of little finger

A: Abduction of little finger, flexion at MP joint

N: Deep ulnar n.

O: Flexor retinaculum (and hamulus of hamate)

I: With AbDM on proximal phalanx

A: Flexion of MP joint of little finger

N: Deep ulnar n.

O: Flexor retinaculum (and hamulus of hamate)

I: Medial border, palmar surface of 5th metacarpal

A: Flexion and lateral rotation of CM joint.

N: Deep ulnar n.

O: Tends of FDP

I: Tendon of ED to digits 2-5

A: Flexion of MP joints and extension of IP joints of digits 2-5

N: Median n. (radial 2) and ulnar n. (ulnar 2)

O: Metacarpal bones: 2, 4, 5 -adductor surface

I: Base of proximal phalanxes: 2, 4, 5 -adductor surfaces and tendons of ED

A: Adduction of digits 2, 4, 5, flexion of MP joints and extension of IP joints

N: Deep ulnar n.

O: Adjacent metacarpals between which muscle lies

I: Base of proximal surfaces of digits 2-4-abductor surface and tendons of ED

A: Abduction of digits 2-4, flexion of MP joints and extension of IP joints

N: Deep ulnar n.