Hand and Thumb Muscles

Question 1

Abductor Pollicis Brevis Muscle

Answer 1

ORIGIN: Flexor Retinaculum, Trapezium, Scaphoid Tubercles

INSERTION: Proximal Phalanx of Thumb

ACTION: Abduction + Assisting in Opposition

Question 2

Flexor Pollicis Brevis Muscle

Answer 2

ORIGIN: Flexor Retinaculum, Trapezium, Trapezoid and Capitate

INSERTION: Proximal Phalanx of Thumb

ACTION: Flexion + Assisting in Opposition

Question 3

Opponents Pollicis Muscle

Answer 3

ORIGIN: Flexor retinaculum + Tubercle of Trapezium

INSERTION: Whole first Metacarpal bone, radial surface

ACTION: Opposition of the thumb at Carpometacarpal Joint

Question 4

Adductor Pollicis Muscle

Answer 4

ORIGIN: Capitate, 2-3d Metacarpals

INSERTION: Proximal Phalanx of Thumb

ACTION: Adduction + Assisting in Flexion

Question 5

Abductor Digiti Minimi Muscle

Answer 5

ORIGIN: Pisiform + tendon of Flexor Carpi Ulnaris

INSERTION: Proximal Phalanx of 5th finger, Ulnar Surface

ACTION: Abduction + Assisting in Opposition

Question 6

Flexor Digiti Minim Brevis Muscle

Answer 6

ORIGIN: Hook of Hamate + Retinaculum Flexor

INSERTION: Proximal Phalanx of 5th finger, palmar surface

ACTION: Flexion + Assisting in Opposition

Question 7

Opponens Digiti Minimi Muscle

Answer 7

ORIGIN: Hook of Hamate + Flexor Retinaculum

INSERTION: Shaft of 5th Metacarpal

ACTION: Opposition at the Carpometacarpal Joint