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The correct answer is the Haversian system.

The set of thin, concentric bony cylinders surrounding a narrow canal containing blood vessels and nerves is called the Haversian system.

  • The bone is laid down around the central canal in the concentric rings called lamellae.
  • The fluid-filled channel is in the centre of the spinal cord.
  • The unit of compact bone is also called a Haversian system.

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