The Haversian system comprises Haversian canal, Haversian lamellae, canaliculi, osteocyte and lacunae. The presence of the Haversian system is a typical feature of mammalian compact bones.
Haversian canal: They are the longitudinal canals which are arranged parallel to the long axis of the bone. In these canals, blood capillaries and nerve fibres are present. The Haversian canals are interconnected by Volkmann's canal. The matrix of bone is synthesised in the form of a layer. These layers of the matrix are called lamellae.
Haversian lamellae: The concentric layers of the matrix are present around the Haversian canal. Between these lamellae, layers of osteocyte cells are also present. Each osteocyte is interconnected with adjacent osteocyte by their cytoplasmic process called canaliculi.