The flexor digitorum profundus muscle is found in the front of the forearm. It can contribute to pain and twitching in the four fingers. It can affect one or any combination of the fingers. It can also cause trigger finger, where a finger will lock in a bent position.
The flexor digitorum superficialis is located in the front of the forearm. It contributes to pain in the four fingers, the palm, and occasionally the wrist. The muscle is a major contributor to trigger finger.
The flexor pollicis longus muscle is located in the forearm, same side as the thumb. It contributes to pain in the middle joint and tip of the thumb. Pinching motions between the forefinger and thumb can cause intense pain. It can also cause the middle thumb joint to pop and sometimes lock.
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 plantaris muscle is a very small muscle located behind the knee. It contributes to pain behind the knee and is occasionally involved in cramps in the calf.
The extensor digitorum brevis muscle can cause pain it the top of the foot. It is also a contributor to hammer toe and claw toe.
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 vastus intermedius muscle can cause and contribute pain down the front of the thigh and knees. Pain increases when walking up an incline or stairs.
The peroneus longus and peroneus brevis contribute to pain on the outside of the ankle, the foot, and pain in the lower leg just below the knee. The muscles are contributors to weak ankles 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.
The adductor hallucis muscle contributes to pain in the ball of the foot just under the toes. It can be a primary contributor to plantar fasciitis.
The rectus femoris muscle contributes to knee and thigh pain. It also contributes to restless leg syndrome and "knee bugs".
The peroneus tertius muscle can cause and contribute to pain in the lower leg bend where the leg, ankle and foot connect. Pain is often felt on the outside of the heel. If your ankles are weak and have a tendency to buckle, you should check this muscle for trigger points and tightness. A classic sign of peroneus tertius dysfunction is pain worsens with each step.
The tibialis posterior muscle can cause and contribute to pain in the lower leg just above the heel. This pain will often extend into the heel and the bottom of the foot. The pain will sometimes extend up into the lower calf. If you have fallen arches, you should check the tibialis posterior for trigger points and tightness because dysfunction of this muscle will allow your ankles to collapse inward.