In normal hand function, the intrinsic muscles, both the lumbricals and interosseus muscles balance finger movement7 and create this broad sweeping movement. Besides abducting and adducting the fingers, they are responsible for coupling metacarpophalangeal joint (MCP) flexion with interphalangeal joints (IP) extension
The intrinsic foot muscles act to stabilise the foot and support the arches, as well as to produce fine movement of the toes. The intrinsic foot muscles can be divided into two main groups, plantar and dorsal.
