A patient with Bennett fracture (a fracture of the base of the first metacarpal bone) experiences an impaired thumb movement. Which of the following intrinsic muscles of the thumb is most likely injured?
The opponens pollicis inses on the first metacarpal. All other intrinsic muscles of the thumb, including the abductor pollicis brevis, the flexor pollicis brevis, and the adductor pollicis muscles, inse on the proximal phalanges.
Abductor pollicis brevis
Flexor pollicis brevis (superficial head)
Opponens pollicis
Adductor pollicis
Upper limb : Miscellaneous