intrinsic thumb musculature Flashcards
1
Q
how many intrinsic (thenar) muscles are there
A
4
primarily take origin from the carpal bones and the flexor retinaculum
2
Q
thenar muscles
A
opponens pollicis
ABD pollicis brevis
flexor pollicis brevis
ADD pollicis
3
Q
thenar muscles
A
opponens pollicis
ABD pollicis brevis
flexor pollicis brevis
ADD pollicis
4
Q
opponens pollicis
A
only intrinsic muscle to insert on the first metacarpal
very effective in positioning the metacarpal in an ABD, flexed and rotated position
5
Q
ABD pollicis brevis
A
helps with ABD
6
Q
flexor pollicis brevis
A
2 heads of insertion
crosses the sesamoid bones –> increases moment arm for flexion
7
Q
ADD pollicis
A
ADD of the thumb
8
Q
which muscles are important for grasping
A
ABD pollicis
flexor pollicis brevis
ADD pollicis
all insert on the proximal phalanx
