Bone and Joint

Cortical bone histology and periosteum

Haversian system and osteon architecture of compact bone, and periosteum structure and function

7 questions 2 source pages

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Q1What is the haversian system (osteon)?▸

Q2What is the role of Volkmann canals?▸

Run transversely to the bone long axis
Permit communication between outer periosteal vessels and the haversian canal

Q3What are osteocytes, lacunae and canaliculi?▸

Osteocytes are trapped osteoblasts located within lacunae between lamellae
Canaliculi are canals occupied by osteocyte cell processes connecting lacunae
Modulate the response of bone to mechanical stimuli
Allow exchange of nutrients and waste products to maintain osteocyte viability

Q4What lamellar types are described in cortical bone?▸

Q5Describe the structure of periosteum.▸

Outer layer of fibroblasts
Inner layer of osteoblasts (cambial layer)
Outer layer: structural support, less cellular, continuous with joint capsule
Inner cambial layer: vascular, osteogenic, contributes to bone growth and fracture healing

Q6What are the functions of periosteum?▸

Q7Which periosteal layer is osteogenic and why?▸

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