Movement Muscle Nerve Nerve root Remarks
Thumb flexion IP FPL (flexor pollicis longus) Median (AIN branch) C8, T1
Finger flexion DIP 2/3 FDP (flexor digitorum profundus) Median (AIN branch) C8 In forearm the FDP is superficial to the FDS
Finger flexion DIP 3/4/5 FDP (flexor digitorum profundus) Ulnar C8 Digits 3,4,5 FDP are banded together.  Flexion of one flexes all. Hold the rest of the digit in extension during the exam
PIP flexion FDS (flexor digitorum superficialis) Median C7 Because FDP of digits 3-5 are linked, can examine one FDS by holding the other digits in extension.
Finger abduction Dorsal interossei Ulnar T1
Finger adduction Palmar interossei Ulnar T1
Thumb adduction ADP (Adductor Pollicis) Ulnar C8 Froment’s sign (pt holds paper tight between thumb and index, absent ADP, the distal thumb will flex)
Thumb palmar abduction APB (Abductor pollicis brevis) Median C8/T1 Also serves opposition.  Affected by carpal tunnel syndrome
Thumb radial abduction APL (Abductor pollicis longus) Radial (Posterior IO) C6C7 Unites with extensor pollicis brevis to form radial side of snuffbox
MCP extension digit 1 (thumb) EPL (extensor pollicis longus) Radial nerve (posterior interosseus branch) C7 On ulnar side of snuff box. Place hand on table, have patient lift thumb up
MCP extension digit 2 EI (extensor indicis proprius) Radial (deep radial) C7
MCP extension digits 2-5 EDC (extensor digitorum communis) Radial (deep radial) C7
MCP extension digit 5 EDM (extensor digiti minimi) Radial (posterior IO branch of deep radial) C7

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