Longest cell

Motor neurons are some 1.3 m (4 ft 3.12 in) long; they have cell bodies (grey matter) in the lower spinal cord with axons (white matter) that carry nerve impulses from the spinal cord down to the big toe. The cell systems that carry certain sensations (vibration and positional sense) back from the big toe to the brain are even longer. Their uninterrupted length, from the toe and up the posterior part of the spinal cord to the medulla of the brain, is about equal to the height of the body.