Nerve fiber = multicellular, containing both an axon and surrounding myelin sheath. The axon comes from a single neuron, but the myelin sheath is made by a train of many myelinating Schwann cells. In the case of unmyelinated axons, the unmyelinated fiber shares each Schwann cell with several other unmyelinated axons.
Flat feet (pes planus) occur when a child has no arch in their foot. Because an arch does not form, the foot appears to turn to the outside. Children with out-toeing due to flatfeet will rarely experience pain symptoms will not require treatment.
In most cases, sore feet can be eliminated with a little TLC during the times when you are not up and around. The most common cause of a sore foot is overuse. If you have no choice but to be on your feet, you may benefit from shoes that offer more support, foot and ankle stability, and protection.