Wrist & Hand - Origin, Insertion

Question 1

Abductor Pollicis Brevis

Answer 1

O - flexor retinaculum, tubercles of trapezium and scaphoid

I - lateral side of base of proximal phalanx of the thumb

Question 2

Flexor Pollicis Brevis

***2 heads of origin

Answer 2

Superficial head O - flexor retinaculum, tubercles of scaphoid and trapezium

Deep head O - trapezoid and capitate bones

I - base of proximal phalanx of the thumb (lat/rad)

Question 3

Opponens Pollicis

Answer 3

O - flexor retinaculum, tubercles of trapezium and scaphoid

I - radial border of 1st MC

Question 4

Adductor Pollicis

***2 heads of origin

Answer 4

oblique head O - bases of 2nd and 3rd MC and capitate

transverse head O - palmar surface 3rd MC

I - ulnar side of base of proximal phalanx of the thumb

Question 5

Opponens Digiti Minimi

Answer 5

O - hook of hamate and flexor retinaculum

I - ulnar border of 5th MC

Question 6

Abductor Digiti Minimi

Answer 6

O - pisiform

I - ulnar side of the base of the proximal phalanx of the little finger

Question 7

Flexor Digiti Minimi

Answer 7

O - hook of hamate and flexor retinaculum

I - ulnar side of base of proximal phalanx of little finger

Question 8

Lumbricals

Answer 8

O - all 4 tendons originate from tendons of the FDP

I - radial side of the dorsal digital expansion of the digits 2-5

Question 9

Palmar Interossei

Answer 9

O - ulnar side of 2nd MC, radial side of 4th and 5th MC

I - dorsal digital expansion

Question 10

Dorsal Interossei

Answer 10

O - arise from adjacent MCs

1st I - radial side of DDE/proximal phalanx of 2nd digit
2nd I - radial side of DDE/proximal phalanx of 3rd digit
3rd I - ulnar side of DDE/proximal phalanx of 3rd digit
4th I - ulnar side of DDE/proximal phalanx of 4th digit