Bone Development and Growth

Bone Development and Growth - Bones increase in length as...

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Bone Development and Growth: There are two types of bone based on the way the bones form 1. INTRAMEMBRANOUS BONES = broad, flat bones of the skull. These bones form from membrane-like sheets of connective tissue 2. ENDOCHONDRAL BONES = all other bones. Bones first form as hyaline cartilage. The cartilage then gradually changes into bone tissue - a process called OSSIFICATION, which begins near the middle of the diaphysis in an area called the PRIMARY OSSIFICATION CENTER. Later the bone begins to ossify in the epiphysis - these areas are called the SECONDARY OSSIFICATION CENTERS. As long as growth is occurring, a "band" of cartilage (called an epiphyseal disk, growth plate) remains between the diaphysis and the epiphysis.
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Unformatted text preview: Bones increase in length as these cartilage cells continue to reproduce and ossify Cartilage cells form cells called OSTEOBLASTS. These cells produce bone matrix and once the cell is enclosed in bone matrix it is considered to be a mature bone cell and called an OSTEOCYTE Growth in thickness of bone occurs as osteoblasts from beneath the periosteum produce bone matrix and build compact bone just underneath the periosteum Bone tissue is constantly being replaced as special cells called OSTEOCLASTS dissolve bone tissue from within the medullary cavity - a process called RESORPTION. At the same time new bone tissue is being added to the outside of the bone....
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This note was uploaded on 11/08/2011 for the course BIOLOGY BSC1086L taught by Professor Leostouder during the Fall '10 term at Broward College.

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