Chapter 6: Bones Skeletal Tissues. The Skeletal System: Osseous Tissue and Skeletal Structure. Introduction - components. The Bones - about 206 Bone tissue , or osseous tissue, is the major component of the skeletal system. Bones are dynamic organs made up of several tissues types.
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Chapter 6: Bones Skeletal Tissues
The Skeletal System:Osseous Tissue and Skeletal Structure
Specialized Bone Cells
Figure 5.1 Structure of a Typical Bone
Figure 5.2b,d The Internal Organization of Representative Bones
Functional Differences between Compact and Spongy Bone
Figure 5.3a Anatomy of a Representative Bone
Figure 5.4 The Periosteum and Endosteum
Human Growth Hormone (hGH):
(estrogen, progesterone, testosterone)
(Ovaries and Testes)
Increases Ca2+ absorption
(Skin and kidneys)
[Insert fig 5.5]
Figure 5.5 Intramembranous Ossification
Figure 5.8 Epiphyseal Cartilages and Lines
1. The perichondrium covering the hyaline cartilage “bone” is infiltrated with blood
2. Osteoblasts secrete osteoid against the hyaline cartilage diaphysis, encasing it in a bony collar.
3. Chondrocytes within the diaphysis hypertrophy and the surrounding cartilage matrix starts to be calcified.
4. The chondrocytes, however, die and the matrix begins to deteriorate.
5. In month 3, the forming cavities are invaded by a collection of elements called the periosteal bud.
6. The entering osteoclasts partially erode the calcified cartilage matrix.
7. Osteoblasts secrete osteoid around the remaining fragments of hyaline cartilage forming trabeculae of spongy bone.
8. As the primary ossification center enlarges, osteoclasts break down the newly formed spongy bone and open up a medullary cavity in the center of the diaphysis.
9. The epiphyses remain formed of cartilage until shortly before or after birth.
10. Secondary ossification centers form in the epiphyses. The events of ossification are like the events of the diaphysis, except, that spongy bone mains in the internal and no medullary cavity forms.
LONGITUDINAL BONE GROWTH
Figure 5.11 Fracture Repair
Table 5.1 Common Bone Marking Terminology
Figure 5.13 Shapes of Bones
Figure 5.14 Examples of Bone Markings