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28 Cards in this Set
- Front
- Back
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2 main types of bone based on macroscopic appearance:
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-spongy
-compact |
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Are spongy and compact bone different microscopically?
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no
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2 types of microscopically different bone:
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-Woven (immature)
-Lamellar (mature) |
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What makes woven bone woven?
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The fact that collagen fibers within it are NOT parallel and organized.
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Why is lamellar bone better?
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Because collagen fibers are parallel and organized, so much stronger.
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What are the systems made up by concentric layers of lamellae in compact bone called?
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Haversian systems
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Another name for a Haversian system?
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Osteon
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What occupies the gaps between osteons?
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Interstitial lamellae
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What is at the center of each osteon?
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Haversian canal
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What is present in the haversian canal in living bone?
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-Blood vessels
-Nerves -Osteoblasts/osteoprogenitors |
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What are the layers of bone that surround the haversian canal?
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Concentric Lamellae
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What are the spaces between lamellae called?
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Lacunae
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What is housed within lacunae?
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Osteocytes
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What are the tiny dark lines that radiate from each lacuna?
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Canaliculi
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What is the function of canaliculi?
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To allow for diffusion of metabolites between bl vessels and adjacent osteocytes via gap junctions.
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What are interstitial lamellae?
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Remnants of older osteons that have been partially resorbed.
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What are the canals that are oriented perpendicular to haversian canals called?
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Volkmann's Perforating canals
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What does spongy bone have?
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Trabeculae
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What is another word for trabeculae?
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Spicules
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What are trabeculae?
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Projections of spongy bone cut in various directions.
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What small cells can be found between trabeculae in spongy bone?
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Red bone marrow cells
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By what type of process does bone grow in girth?
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Appositional
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What are chondroclasts?
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Multinucleated cells that eat up cartilage as it is replaced by bone during endochondral ossification.
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Are chondroclasts different from osteoclasts? Where would you find them?
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Only in terms of what they break down.
-Found in calcification and ossification zones of the epiphyseal plate. |
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What are the 5 zones of the epiphyseal plate?
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1. Reserve zone
2. Proliferative zone 3. Hypertrophy zone 4. Calcification zone 5. Ossification zone |
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What has cell nests, cartilage or bone?
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Cartilage
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Which has blood vessels within the matrix, cartilage or bone?
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Neither
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Which has lamellae?
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Bone
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