Chapter 6 Bone and Skeletal Tissue part 2

Chapter 6 Bone and Skeletal Tissue part 2 - Chapter 6 Bone...

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Unformatted text preview: Chapter 6 Bone and Skeletal Tissue Part 2 Angela Peterson-Ford, PhD [email protected] 6 Bones and Skeletal Tissues Part 2 Stages of Intramembranous Ossification An ossification center appears in the fibrous connective tissue membrane Bone matrix is secreted within the fibrous membrane Woven bone and periosteum form Bone collar of compact bone forms, and red marrow appears Stages of Intramembranous Ossification Figure 6.7.1 Stages of Intramembranous Ossification Figure 6.7.2 Stages of Intramembranous Ossification Figure 6.7.3 Stages of Intramembranous Ossification Figure 6.7.4 Endochondral Ossification Begins in the second month of development Uses hyaline cartilage “bones” as models for bone construction Requires breakdown of hyaline cartilage prior to ossification Stages of Endochondral Ossification Formation of bone collar Cavitation of the hyaline cartilage Invasion of internal cavities by the periosteal bud, and spongy bone formation Formation of the medullary cavity; appearance of secondary ossification centers in the epiphyses Ossification of the epiphyses, with hyaline cartilage remaining only in the epiphyseal plates Formation of bone collar around hyaline cartilage model. 1 2 3 4 Cavitation of the hyaline cartilage within the cartilage model. Invasion of internal cavities by the periosteal bud and spongy bone formation. 5 Ossification of the epiphyses; when completed, hyaline cartilage remains only in the epiphyseal plates and articular cartilages Formation of the medullary cavity as ossification continues; appearance of secondary ossification centers in the epiphyses in preparation for stage 5. Hyaline cartilage Primary ossification center Bone collar Deteriorating cartilage matrix Spongy bone formation Blood vessel of periostea l bud Secondary ossification center Epiphyseal blood vessel Medullary cavity Epiphyseal plate cartilage Spongy bone Articular cartilage Stages of Endochondral Ossification Figure 6.8 Postnatal Bone Growth Growth in length of long bones Cartilage on the side of the epiphyseal plate closest to the epiphysis is relatively inactive Cartilage abutting the shaft of the bone organizes into a pattern that allows fast, efficient growth Cells of the epiphyseal plate proximal to the resting cartilage form three functionally different zones: growth, transformation, and osteogenic Functional Zones in Long Bone Growth Growth zone – cartilage cells undergo mitosis, pushing the epiphysis away from the diaphysis Transformation zone – older cells enlarge, the matrix becomes calcified, cartilage cells die, and the matrix begins to deteriorate Osteogenic zone – new bone formation occurs Long Bone Growth and Remodeling...
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This note was uploaded on 01/06/2012 for the course BIOL 2401 taught by Professor Elainefanin during the Spring '11 term at Collins.

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Chapter 6 Bone and Skeletal Tissue part 2 - Chapter 6 Bone...

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