Definition:
The wrist (radial-carpal) joint is a synovial joint formed by articulation of
the distal end of radius and the triangular articular disc with the scaphoid,
lunate & triquentral.
Type:
Synovial ellipsoid joint.
Fibrous capsule and ligament:
Fibrous capsule enclose the joint and is lined by synovial membrane, which is
attached to the margins of the articular surafces. Fibrous cpasule is
strengthened by palmar radio-carpal and ulno-carpal, dorsal radio-carpal and
radial ulnar collateral ligaments.
Nerve
supply: Anterior and posterior interosseous
nerve.
Movements:
[A]
Flexion:
1)
Flexor carpi radialis.
2)
Flexor carpi ulnaris.
3)
Palmaris longus.
Assisted by:
1)
Flexor digitorum superficialis.
2)
Flexor digitorum profundus.
3)
Flexor pollicis longus.
[B]
Extension:
1)
Extensor carpi radialis longus.
2)
Extensor carpi radialis brevis.
3)
Extensor
carpi ulnaris.
Assisted by:
1)
Extensor digitorum.
2)
Extensor indicis.
3)
Extensor digiti minimi.
4)
Extensor pollicis longus.
[C]
Abduction:
1) Flexor
carpi radialis.
2) Extensor
carpi radialis longus.
3) Extensor
carpi radialis brevis.
Assisted
by:
1) Abductor
pollicis longus.
2) Extensor
pollicis longus.
3) Extensor
pollicis brevis.
[D] Adduction:
1)
Flexor carpi ulnaris.
2)
Extensor carpi ulnaris.
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