Which term refers to canaliculi?

• A. Haversian canal
• B. Neurocranium
• C. Canaliculi
• D. Osteon

Answer: (C)

Canaliculi are the network of tiny channels in bone that connect lacunae and allow the cytoplasmic processes of neighboring osteocytes to connect via gap junctions. This setup lets nutrients and signaling molecules diffuse from the blood supply in the central (Haversian) canal through the mineralized matrix to all osteocytes, and it also enables waste removal and coordinated cellular activity for remodeling. In compact bone, canaliculi radiate through the lamellae to link each osteocyte to others and to the central canal, forming a communication and nutrient-distribution network. This distinguishes canaliculi from the central Haversian canal, which houses blood vessels and nerves, and from the osteon as the whole unit of concentric lamellae around that canal. The neurocranium is simply the skull bones enclosing the brain and is not related to this microscopic bone structure.