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CHAPTER OBJECTIVES

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At the completion of this chapter, the reader will be able to:

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  1. Describe the various types of biological tissue of the musculoskeletal system.

  2. Describe the tissue mechanics and structural differences and similarities between muscle, tendons, fascia, and ligaments.

  3. Describe the different types of joints and their various characteristics.

  4. Define the various terminologies used to describe the joint position, movements, and relationships.

  5. Give definitions for commonly used biomechanical terms.

  6. Describe the different planes of the body.

  7. Define the body’s center of mass and its location.

  8. Describe the different axes of the body and the motions that occur around them.

  9. Define the terms osteokinematic motion and arthrokinematic motion.

  10. Differentiate between the different types of motion that can occur at the joint surfaces.

  11. Describe the basic biomechanics of joint motion in terms of their concave–convex relationships.

  12. Define the terms close-packed and open-packed.

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OVERVIEW

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The correct embryonic development of the musculoskeletal system requires a coordinated morphogenesis of the fundamental tissues of the body. Throughout the human body, there are four major types of tissues:

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  • Epithelial. Covers all internal and external body surfaces and includes structures such as the skin and the inner lining of the blood vessels.

  • Connective. Connective tissue (CT), which includes four different classes: connective tissue proper, bone, cartilage, and blood tissue. In the embryo, muscle tissue and its fascia form as a differentiation of the paraxial mesoderm that divides into somites on either side of the neural tube and notochord. The cartilage and bone of the vertebral column and ribs develop from the sclerotome which is the anterior (ventral) part of the somite.1 The dermomyotome, which is the posterior (dorsal) part of the somite, gives rise to the overlying dermis of the back and the skeletal muscles of the body and limbs.1 Connective tissue provides structural and metabolic support for other tissues and organs of the body.

  • Muscle. Muscles are classified functionally as either voluntary or involuntary, and structurally as either smooth, striated (skeletal), or cardiac. There are approximately 430 skeletal muscles in the body, each of which can be considered anatomically as a separate organ. Of these 430 muscles, about 75 pairs provide the majority of body movements and postures.2

  • Nervous. Nervous tissue provides a two-way communication system between the central nervous system (brain and spinal cord) and muscles, sensory organs, and various systems (see Chapter 3).

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CONNECTIVE TISSUE

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CT proper has a loose, flexible matrix, called ground substance. The most common cell within CT proper is the fibroblast. Fibroblasts produce collagen, elastin, and reticular fibers:

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  • Collagen is a group of naturally occurring proteins. The collagens are a family of extracellular matrix (ECM) proteins that play a dominant role in maintaining the structural integrity of various tissues and in providing tensile strength to tissues. The ECM is formed from glycosaminoglycans (GAGs) subunits, ...

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