Muscles of the Hand Flashcards
Palmaris Brevis (not always present)
Origin - Palmer aponeurosis and flexor retinaculum
Insertion - skin on the medial side of the hand
Innervation - ulna nerve
Action - tightens the apnonerosis
Adductor Pollicis transverse
Origin - 3rd metacarpal
Insertion - 1st proximal phalanx
Innervation - ulna nerve
Action - Adduct the thumb
Adductor Pollicis Oblique
Origin - Capitate bone
Insertion - 1st proximal phalanx
Innervation - ulna nerve
Action - adduct the thumb
Lumbricals (x4)
Origin - tendon of flexor digitorum profundus 2nd to 5th digits
Insertion - Radial side of proximal phalanx
Innervation - 1st and 2nd are median, 3rd and 4th are ulna
Action - Flexion of metacarpophalangeal joint and extension of both interphalangeal joints
Palmer interossi (x4)
Origin - 3rd 4th and 5th metacarpal bone
Insertion - 2nd and 3rd ulna side of proximal phalanx, 1st and 2nd radial side of proximal phalanx
Innervation - ulna nerve
Action - adduction of the digits (PAD)
Dorsal interossi (4)
Origin - 2 head arising from the metacarpals of the digits they sit between
Insertion - 1st onto the radial side of proximal phalanx of digit 2. 2nd and 3rd onto respective side of the proximal phalanx of digit 3. 4th onto the ulna side of the 4th digit
Innervation - Ulna nerve
Action - Abduction of the digits (DAB)
Abductor Pollicis Brevis (thenar)
Origin - Scaphoid and trapezium
Insertion - proximal phalanx of the 1st digit
Innervation - median nerve
Action - abduction of 1st digit
opponens Pollicis (thenar)
Origin - Trapezium
Insertion - 1st metacarpal
Innervation - median nerve
Action - opposition of the first digit at the carpometacarpal joint
Flexor pollicis brevis (thenar)
Origin - capitate and trapezium
Insertion - proximal phalanx of 1st digit
Innervation - median nerve
Action - flexion of the 1st digit at the metacarpophalangeal joint
Abductor Digiti Minimi (hypothenar)
Origin - Pisiform
Insertion - base of the 5th proximal phalanx
Innervation - ulna nerve
Action - Abduction of the 5th digit
Flexor Digiti Minimi brevis (hypothenar)
Origin - Hook of hamate
Insertion - 5th proximal phalanx
Innervation - ulna nerve
Action - flexion of the metacarpophalangeal joint of the 5th digit
Opponens Digit Minimi
Origin - Hook of Hamate
Insertion - 5th metacarpal
Innervation - ulna nerve
Action - opposition of 5th digit
