The only movements permitted in the joints of the digits are
flexion and
extension; these movements are more extensive between the first and second phalanges than between the second and third. The
flexor hallucis longus and
flexor digitorum longus flex the interphalangeal joint of the big toe and lateral four toes, respectively. The tendons of both of these muscles cross as they reach their distal attachments. In other words, the flexor hallucis longus arises laterally, while the flexor digitorum longus arises medially. The amount of flexion is very considerable, but extension is limited by the
plantar and
collateral ligaments. , bottom (
plantar) surface. Joints are not labelled, but region is visible. ==See also==