Define osteon. A)An osteon is the functional unit of spongy bone. B)An osteon is the functional unit of compact bone. C)An osteon is the structural unit of spongy bone. D)An osteon is functional unit of trabecular bone. E)An osteon is the nest that an osteocyte occupies.

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An osteon, also called a Haversian system, is the structural and functional unit of compact bone. It is a cylindrical structure composed of concentric layers of bone tissue called lamellae, surrounding a central canal called the Haversian canal. The lamellae contain osteocytes, which are connected to each other and the central canal via tiny channels called canaliculi, and the Haversian canal contains blood vessels and nerves.

Define Osteon