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.
Wearing footwear with a constricting toe box can lead to overlapping toes. Another common cause is bunions, found more in adult women, while overlapping of the fifth toe may occur among children. Ill-fitting shoes, apart from the pain they can cause because of the faulty fitting, are another cause of this foot problem.