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.
If closed-toe shoes (such as ballet flats or heels) must be worn without socks, the best prevention of foot odor is to slip the shoes off momentarily, at least part-way, whenever the feet start to feel hot or sweaty, to allow sweat to evaporate from the feet and shoes.