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.
1 Shoes: Tight shoes fold and shift toes out of place. 2  Heeled shoes push toes upward. 3  When toes are held in one position too much, the muscles tighten and don't go back to normal length. 4  How You Use Foot Muscles: Many people do not use muscles in their feet or toes when they walk.