Editing Carpal bones (section)

==== Radial abduction/ulnar adduction ====
[[File:Braus 1921 210.png|thumb|'''Left''': Ulnar adduction<br>'''Right''': Radial abduction]]
[[File:Braus 1921 214.png|thumb|'''Left''': Dorsiflexion<br>'''Right''': Palmar flexion]]
During '''radial abduction''' the scaphoid is tilted towards the palmar side which allows the trapezium and trapezoid to approach the radius. Because the trapezoid is rigidly attached to the second metacarpal bone to which also the flexor carpi radialis and extensor carpi radialis are attached, radial abduction effectively pulls this combined structure towards the radius. During radial abduction the pisiform traverses the greatest path of all carpal bones.
<ref name="Platzer-132" />
Radial abduction is produced by (in order of importance) [[Extensor carpi radialis longus muscle|extensor carpi radialis longus]], [[Abductor pollicis longus muscle|abductor pollicis longus]], [[Extensor pollicis longus muscle|extensor pollicis longus]], [[Flexor carpi radialis muscle|flexor carpi radialis]], and [[Flexor pollicis longus muscle|flexor pollicis longus]].
<ref name="Platzer-172">Platzer 2004, p 172</ref>

'''Ulnar adduction''' causes a tilting or dorsal shifting of the proximal row of carpal bones.<ref name="Platzer-132" />
It is produced by [[Extensor carpi ulnaris muscle|extensor carpi ulnaris]], [[Flexor carpi ulnaris muscle|flexor carpi ulnaris]], [[Extensor digitorum muscle|extensor digitorum]], and [[Extensor digiti minimi muscle|extensor digiti minimi]].<ref name="Platzer-172" />

Both radial abduction and ulnar adduction occurs around a dorsopalmar axis running through the head of the capitate bone.
<ref name="Platzer-132" />