Bone canaliculus

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Bone canaliculus

Compact spongy bone
Latin	Canaliculus ossis
Code	TH H2.00.03.7.00003

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.

Musculoskeletal system · connective tissue: bone and cartilage (TA A02.0, TH H3.01, GA 2.86–95)

Cartilage

cells (chondroblast
chondrocyte)

types (hyaline
elastic
fibrous)

Bone

Ossification	intramembranous endochondral

Cycle	osteoblast osteoid osteocyte osteoclast

Types	cancellous cortical

Regions	subchondral bone epiphysis epiphyseal plate/metaphysis diaphysis Condyle Epicondyle

Structure	osteon / Haversian system 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

M: BON/CAR

anat (c/f/k/f, u, t/p, l)/phys/devp/cell

noco/cong/tumr, sysi/epon, injr

proc, drug (M5)

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