The flexor digitorum longus muscle can cause and contribute to pain in the foot that radiates into the back of the leg. It can contribute to the development of hammertoe and claw toe.
The flexor hallucis longus can cause and contribute to pain in the big toe and ball of the foot. A classic sign of flexor hallucis longus dysfunction is numbness on the bottom of the big toe.
The extensor hallucis longus muscle contributes to and can cause pain and/or numbness in the top of the foot, pain in the big toe, and foot cramps at night. It is a contributor to hammertoe and claw toes.
The extensor digitorum longus contributes to pain in the top of the foot. It contributes to hammertoe, claw toe, and foot drop.
The tibialis anterior can cause and contribute to pain in the big toe, the ankle and shine, and contributes to a weak ankle. It is also a contributor to shin splints and foot drop.
The flexor hallucis brevis muscle contributes to pain on the bottom of the foot, just under the big toe. It can also be a factor in plantar fasciitis, hammer toe, turf toe and gout.