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.
Flat Foot is a rather vague term which refers to a foot which pronates excessively or remains in an excessively pronated position during stance and gait. Flat feet may be caused by any one of many different conditions such as a tight heel cord (Achilles tendon), congenital deformities(e.g.he big toe drifts the opposite direction toward the 2nd toe. The bunion prominence is often caused by some enlargement of the head of the 1st metatarsal bone as well as the position of the 1st metatarsal bone as it protrudes from the side of the foot.