[gx id=""]EXTRINSIC MUSCLES[/gx] |
Extensor pollicis longus | Middle dorsal ulna | Dorsal distal phalanx of thumb | Extension at MP and IP joints of thumb, adduction
at MP joint of thumb | Radial (C7, C8) |
Extensor pollicis brevis | Middle dorsal radius | Dorsal proximal phalanx of thumb | Extension at MP and CM joints of thumb | Radial (C7, C8) |
Flexor pollicis longus | Middle palmar radius | Palmar distal phalanx of thumb | Flexion at IP and MP joints of thumb | Median (C8, T1) |
Abductor pollicis longus | Middle dorsal ulna and radius | Radial base of 1st metacarpal | Abduction at CM joint of thumb | Radial (C7, C8) |
Extensor indicis | Distal dorsal ulna | Ulnar side of extensor digitorum tendon | Extension at MP joint of 2nd digit | Radial (C7, C8) |
Extensor digitorum | Lateral epicondyle of humerus | Base of 2nd and 3rd phalanges, digits
2–5 | Extension at MP, proximal and distal IP joints, digits
2–5 | Radial (C7, C8) |
Extensor digiti minimi | Proximal tendon of extensor digitorum | Tendon of extensor digitorum distal to 5th MP
joint | Extension at 5th MP joint | Radial (C7, C8) |
Flexor digitorum profundus | Proximal three-fourths of ulna | Base of distal phalanx, digits 2–5 | Flexion at distal and proximal IP joints and MP joints, digits
2–5 | Ulnar and median (C8, T1) |
Flexor digitorum superficialis | Medial epicondyle of humerus | Base of middle phalanx, digits 2–5 | Flexion at proximal IP and MP joints, digits 2–5 | Median (C7, C8, T1) |
[gx id=""]INTRINSIC MUSCLES[/gx] |
Flexor pollicis brevis | Ulnar side, 1st metacarpal | Ulnar, palmar base of proximal phalanx of thumb | Flexion and adduction at MP joint of thumb | Median (C8, T1) |
Abductor pollicis brevis | Trapezium and schaphoid bones | Radial base of 1st phalanx of thumb | Abduction at 1st CM joint | Median (C8, T1) |
Opponens pollicis | Schaphoid bone | Radial side of 1st metacarpal | Flexion and abduction at CM joint of thumb | Median (C8, T1) |
Adductor pollicis | Capitate, distal 2nd and 3rd metacarpals | Ulnar proximal phalanx of thumb | Adduction and flexion at CM joint of thumb | Ulnar (C8, T1) |
Abductor digiti minimi | Pisiform bone | Ulnar base of proximal phalanx, 5th digit | Abduction and flexion at 5th MP joint | Ulnar (C8, T1) |
Flexor digiti minimi brevis | Hamate bone | Ulnar base of proximal phalanx, 5th digit | Flexion at 5th MP joint | Ulnar (C8, T1) |
Opponens digiti minimi | Hamate bone | Ulnar metacarpal of 5th metacarpal | Opposition at 5th CM joint | Ulnar (C8, T1) |
Dorsal interossei (four muscles) | Sides of metacarpals, all digits | Base of proximal phalanx, all digits | Abduction at 2nd and 4th MP joints,
radial and ulnar deviation at 3rd MP joint, flexion at
MP joints 2–4 | Ulnar (C8, T1) |
Palmar interossei (three muscles) | 2nd, 4th, and 5th metacarpals | Base of proximal phalanx, digits 2, 4, and 5 | Adduction and flexion at MP joints, digits 2, 4, and
5 | Ulnar (C8, T1) |
Lumbricales (four muscles) | Tendons of flexor digitorum profundus, digits 2–5 | Tendons of extensor digitorum, digits 2–5 | Flexion at MP joints of digits 2–5 | Median and ulnar (C8, T1) |