What is the structural unit of compact bone?

Osteon is the structural unit of compact bone.

Explanation:

Compact bone is present around the medullary cavity and forms the external layer of the bones. Compact bone is made up of structural units called osteon.

Osteon is also known as haversian sysytem. Osteons contain mineral matrix and connencted by canaliculi. Osteons helps in the transportation of blood. Osteonic canal is known as haversian canal and aligned parallel with the long bones. Osteon contains lamellae that forms the layer of the compact matrix. Osteon prevents the bone from fracture and resist the bending of bones.