Bone canaliculus

Bone canaliculus
Compact spongy bone
Details
Identifiers
Latin	Canaliculus ossis
Code	TH H2.00.03.7.00003
*Anatomical terminology* [edit on Wikidata]

Bone canaliculi are microscopic canals between the lacunae of ossified bone. The radiating processes of the osteocytes (called filopodia) project into these canals. These cytoplasmic processes are joined together by gap junctions. Osteocytes do not entirely fill up the canaliculi. The remaining space is known as the periosteocytic space, which is filled with periosteocytic fluid. This fluid contains substances too large to be transported through the gap junctions that connect the osteocytes, including calcium and phosphate ions.

In cartilage, the lacunae and hence, the chondrocytes, are isolated from each other. Materials picked up by osteocytes adjacent to blood vessels are distributed throughout the bone matrix via the canaliculi.

Bone and cartilage

Cartilage

Bone

Ossification	Primary bone intramembranous endochondral

Cells	osteoblast osteoid osteocyte osteoclast

Types	cancellous cortical

Regions	subchondral bone epiphysis epiphyseal plate/metaphysis diaphysis Condyle Epicondyle

Structure	Osteon Haversian canals Volkmann's canals connective tissue endosteum periosteum Sharpey's fibres enthesis lacunae canaliculi trabeculae medullary cavity bone marrow

Shapes	long short flat irregular sesamoid

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