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A' is a cylindrical that begins from the...

A' is a cylindrical that begins from the lower end of medulla and extend downwards.It is enclosed in bony cage'B'and covered by membranes 'C'.As many as 'D' pairs of nerves arise from the structure'A'(i)What is A?
(ii)Name (a)bony cage 'B'and (b)membranes 'C'
(iii)How mcuh is D?

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