opposition of the thumb Flashcards
1
Q
occurs in 4 stages
A
pre
opposition
post
reposition
2
Q
pre
A
the thumb is ABD at the CMC joint
ABD pollicis longus and brevis
3
Q
opposition
A
thumb is flexed and medially rotated by 3 thenar muscles
opponens pollicis, ABD pollicis brevis and flexor pollicis brevis
4
Q
post
A
thumb maintains pressure on the finger tip to which it is opposed
ADD pollicis, flexor pollicis longus
5
Q
reposition
A
the return of thumb to resting position
extensor pollicis longus and brevis and abductor pollicis longus
