Uberon definition : the most superior muscles in the sole of the foot that abduct the second to fourth
toes. These four muscles also act through the dorsal expansions to resist extension
of the metatarsophalangeal joints and flexion of the interphalangeal joints.;
the most superior muscles in the sole of the foot that abduct the second to fourth
toes. These four muscles also act through the dorsal expansions to resist extension
of the metatarsophalangeal joints and flexion of the interphalangeal joints.