define symptoms in nervous system of pernicious

Question

Define symptoms in Nervous system of pernicious anaemia?

Parasthesia (numbness and tingling) occurs in fingers and toes.  Occasionally, there are objective signs of involvement of the spinal cord (vitamin B₁₂ neuropathy). In advanced cases, demyelination of the white fibres d the spinal cord occurs, &affecting first the dorsal column and later the lateral column. Historically, PA was considered to be the major cause of vitamin B₁₂ deficiency, more  recently, it has been suggested that a far more common problem is that of  hypochlorhydria associated with atrophic gustritis, where there is a progressive  reduction, with age, of the ability of the parietal cells to secrete hydrochloric acid.