Second Order: Wrist, Hand, Thumb Part 2

2 lateral carpal bones (trapezium and scaphoid)

base of proximal phalanx of thumb, radial side

abducts CMC and MC joint, extends IP joint of thumb

median

posterior surface of middle 1/3 of ulna

dorsal aspect of base of distal phalanx of thumb

extend IP and MCP joint of thumb, assists with abduction and extension of wrist

radial

posterior surface of distal 1/3 of radius

dorsal aspect of base of proximal phalynx of thumb

extend and abduct CMC and extend MCP joints of thumb; assist in abduction of wrist

radial

anterior surface of radius and adjacent interosseous membrane

base of distal phalnax of thumb

flex IP joint of thumb, assist in flexion of MCP and CMC joints of thumb, assist in flexion of wrist

median

3 lateral carpal bones (trapezium, trapezoid, capitates)

proximal phalanx of thumb

flex MCP and CMC (carpometacarpal) joints of thumb, assist in opposition

median and ulnar

1 lateral carpal bone (trapezium and flexor retinaculum)

1st metacarpal bone

opposes (flex, abd, and IR) carpometacarpal joint of thumb (touching pads of digit 1 and 5)

median (C6-T1)

lateral carpal bone (capitate) and mid metacarpal bone (2 and 3)

medial proximal phalanx

adducts CMC joint (adducts and assists in flexion of MCP joint)

ulnar