Chapter 5 - Hand MMT Innervations

Question 1

finger PIP and DIP flexion

Answer 1

median n. (C8-T1) ==> flexor digitorum superficialis; flexor digitorum profundus (fingers 2 and 3)
ulnar n. (C8-T1) ==> flexor digitorum profundus (fingers 4 and 5)

• PIP test isolates FDS*
• DIP test isolates FDP*

Question 2

finger MP extension

Answer 2

radial n. (C7-C8) ==> extensor digitorum; extensor digiti minimi; extensor indicis

Question 3

finger abduction

Answer 3

ulnar n. (C8-T1) ==> dorsal interossei; abductor digiti minimi

Question 4

finger adduction

Answer 4

ulnar n. (C8-T1) ==> palmar interossei

Question 5

thumb MP and IP flexion

Answer 5

median n. (C8-T1) ==> flexor pollicis longus; flexor pollicis brevis (superficial head)
ulnar n. (C8-T1) ==> flexor pollicis brevis (deep head)

• thumb MP flexion isolates FPB*
• thumb IP flexion isolates FPL*

Question 6

thumb MP and IP extension

Answer 6

radial n. (C7-C8) ==> extensor pollicis brevis; extensor pollicis longus

• thumb MP extension isolates EPB*
• thumb IP extension isolates EPL*

Question 7

thumb abduction

Answer 7

median n. (C8-T1) ==> abductor pollicis brevis

radial n. (C7-C8) ==> abductor pollicis longus

Question 8

thumb adduction

Answer 8

ulnar n. (C8-T1) ==> adductor pollicis (transverse and oblique heads)

Question 9

opposition

Answer 9

median n. (C8-T1) ==> opponens pollicis

ulnar n. (C8-T1) ==> opponens digiti minimi; opponens pollicis

Question 10

finger MP flexion

Answer 10

median n. (C8-T1) ==> 1st and 2nd lumbricals

ulnar n. (C8-T1) ==> 3rd and 4th lumbricals; all interossei