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A' is a cylindrical structure that begin...

A' is a cylindrical structure that begins from the lower end of medulla and extend downwards. It is enclosed in bony cage 'B' and covered by membrance 'C'. As many 'D' pairs of nerves arise from the structure 'A': How many pairs are 'D'?

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A' is a cylindrical structure that begins from the lower end of medulla and extend downwards. It is enclosed in bony cage 'B' and covered by membrance 'C'. As many 'D' pairs of nerves arise from the structure 'A': What is 'A'.

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