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Questions and Answers
What is the structural unit of compact bone called?
osteon or Haversian system
Which of the following structures are part of the Haversian system? (Select all that apply)
What does the Haversian system/osteon do?
It is a structural unit in which many units are cemented together to form the substance of compact bone.
What are the parts of the Haversian system?
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What is lamellae?
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What is lacunae?
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What is canaliculi?
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What is the function of central (Haversian) canals?
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What is the function of the perforating (Volkmann's) canals?
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What is a difference between spongy bone and compact bone?
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What is the structure of spongy bone?
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What do the spaces between trabeculae in spongy bone contain?
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Study Notes
Compact Bone Structure
- The basic structural unit of compact bone is the osteon, also known as the Haversian system.
- Components of the Haversian system include lamellae, lacunae, canaliculi, central (Haversian) canals, and perforating (Volkmann's) canals.
Haversian System Function
- The Haversian system serves as a structural unit where multiple units integrate to form the dense structure of compact bone.
Parts of the Haversian System
- Lamellae: Cylindrical layers of calcified matrix aligned parallel to the central canal.
- Lacunae: Small cavities between lamellae housing osteocytes, the bone cells.
- Canaliculi: Tiny channels that interconnect lacunae and connect them to the central canal.
Central Canals
- Central (Haversian) canals run longitudinally through compact bone and house blood vessels that nourish the osteons.
Perforating Canals
- Perforating (Volkmann's) canals run perpendicular to the long axis of the bone, facilitating blood supply to deeper layers of the bone and the interior marrow cavity.
Spongy Bone Differences
- Spongy bone lacks osteons and has a distinct structural layout compared to compact bone.
Structure of Spongy Bone
- Composed of trabeculae, which are irregular, thin bone plates.
- The spaces between trabeculae are filled with red marrow, responsible for producing blood cells.
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Description
Explore the complexities of bone structure with this quiz focused on compact and spongy bone. Learn about the Haversian system, its components, and their functions. Ideal for students studying anatomy and physiology.
