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Related Flashcards
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Cards In This Set
| Front | Back |
 Cartilage |
Resilient tissue that is poorly vascularlized
-Hyaline -Elastic -Fibrocartilage |
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Hyaline Cartilage
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-Articular cartilages and coastal (rib) cartilage, larynx, trachea, and nose
-Rich in collagen fibers and appear glassy -Most abundant cartilage -Support and flexibility and resisting compression -Forms embryonic skeleton |
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Elastic Cartilage
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-Ear pinna and epiglottis
-Contains many elastic/collage fibers -Able to tolerate repeated bending |
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Fibrocartilage
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-Intervertebral discs, knee menisci, pubic symphysis
-Inermediate between hyaline and elastic cartilage -Resists strong compression and strong tension (pulling pressures) |
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Chondocyte in Lacunae
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Produce additional cartilage tissue
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Perichondrium
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Round; membrane of fibrous connective tissue that surrounds the external surface of cartilage
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Appositional Growth
Think: new cartilage |
Chondoblasts in surrounding perichondrium produce new cartilage; produce cartilage inside
-Growth of bone by addition of bone tissue to its surface |
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Interstitial Growth
Think: matrix |
Chondrocytes within cartilage divide and secrete new matrix
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Tissue in Bones
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-Come from mesoderm
-Dominated by bone connective tissue -Contain nervous tissue (ectoderm) and blood connective tissue -Contain cartilage in articular cartilages -Contain epithelial tissue lining blood vessels |
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What germ layer is the inside layer of bone made out of?
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Endoderm
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Function of Bones
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-Support, movement, protection, mineral storage, bone-cell formation (bone contains bone red marrow), energy metabolism (osteoblasts secrete osetocalcin)
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Osteocalcin
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Stimulates pancreas to produce more insulin and fat cells to become insulin sensitive
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Extracellular Matrix
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35% organic
-Rich in collagen - provides tensile strength; contributes to flexibility 65% inorganic -Mineral salts (ex: calcium phosphate) lie around collagen fibrils -Mineral salts pack tightly to give bone its hardness to rest compression -Bones don't resist torsion forces well |
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Osteogenic cells
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-Stem cells that differentiate into osteoblasts
-From or composed of any tissue concerned in bone growth or repair |
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Osteoblasts
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Actively produce and secrete bone matrix (ground matrix and collagen fibrils)
-Bone matrix is osteoid -Within weeks of secretion, inorganic calcium salts crystallize within osteoid -Add bone tissue to external surface along diaphysis |
