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 gastrocnemius muscle is a prime contributor to pain in the back of the knee. It can contribute to lower leg, ankle, and arch pain.
The soleus muscle can cause and contribute to pain in the heel, ankle and back of the knee. It can also cause pain in the low back on the same side of the affected leg. Dysfunction of the soleus muscle can also contribute to swelling in the foot and ankle. Occasionally a trigger point at the bottom and outside of the muscle can contribute to pain in the jaw and side of the head.