Chapter 7

Chapter 7 - Chapter 7: Bone Tissue Tissues and Organs of...

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Chapter 7: Bone Tissue Tissues and Organs of the Skeletal System. Functions of the Skeleton 1. The skeleton functions in support, protection, movement, blood formation, electrolyte balance, acid-base balance, and detoxification of the body. Bones and Osseous Tissue 1. The study of bones if osteology. 2. Osseous tissue is predominantly in bones, but also present are blood, marrow, cartilage, adipose tissue, nerves and fibrous connective tissue. The shapes of Bones 1. Long bones include those in the appendages that produce body movement. 2. Short bones are equal in length and width, such as those of the wrist and ankle. 3. Flat bones, such as in the skull, protect soft tissue. 4. Irregular bones have elaborate shapes that don’t’ fit any of the previous categories = vertebrae. General Features of Bones. 1. The features of a long bone include its outer payer of compact bone, a medullary cavity containing bone marrow, and spongy bone at its ends. 2. The shaft of a long bone is referred to as the diaphysis, the expanded ends are the epiphyses. 3. The epiphyses are covered with articular cartilage, and the outer bone is covered by periosteum. The inside is lined with endosteum. 4. During growth, an epiphyseal plate of hyaline cartilage forms a model for bone to replace.
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Histology of Osseous Tissue. CELLS 1. Osteogenic cells develop from mesenchyme and occur in the endosteum, the inner periosteum and the haversian canals. They are the only source of osteoblasts and asteocytes. 2. Osteoblasts are bone-forming cells that build new bone matrix. 3. Osteoctyes are osteoblasts trapper in bone matrix. They remain active in bone maintenance. 4. Osteoclasts are bone-dissolving cells that form by fusion of monocytes.
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This note was uploaded on 04/17/2008 for the course BIOL 211 taught by Professor Wilson during the Fall '07 term at Winona.

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Chapter 7 - Chapter 7: Bone Tissue Tissues and Organs of...

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