IMG_0096 - synovial fluid, a lubricating liquid that...

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LABORATORYl2 Articulations cartilages. In this joint, hyaline cartilage binds the ribs to the sternum yet lets them move somewhat. A symphysis (SlM-fih-sis) is a fibrocartilaginous pad between the pubic bones (for example, the pubic symphy- sis) or in the intervertebral discs. These joints also allow for some movement. The physical stress on a s1'rnphysis is greater than that on the costal cartilages, and the joint reflects this in its fibrocartilage composition. Fibrocartilage endures much greater stress than hyaline cartilage. Locate a symphysis in lab and compare it to figure 12.4, which comptres symphyses to costal cartilages. SynovialJoints Joints that allow for extensive movement are called synovial joints. The outer part of the synovial ioint is the joint capsule, which is made of an outer fibrous capsule and an FIGURE 12.4 Movable Synchondroses (a) Costal cartilages; (b) pubic symphysis; (c) intervertebral disc. inner synovial membrane. The synovial membrane secretes
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Unformatted text preview: synovial fluid, a lubricating liquid that reduces friction inside the joint, The space inside the joint is called the synovial cavity, and each bone of the joint ends in a hyaline cartilage cap called the articular cartilage. There are other structures in synovial joints that are characteristic of spe-cific joints, and these are discussed later in this exercise. The shape of the bones determines the type of movement at the articulation, and in general the more movable a joint is, the less stable it is, The stability of a joint depends on the number and types of ligaments, tendons, and muscles and on the way the bones fit together, Compare the features of the joint in figure 12.5 to models or charts in the lab. Dissection of a Synovial loint To understand the struc-ture of a synovial joint, it is beneficial to examine a fresh lnterpubic disc (fibrocartilage) Costal (b) Pubic symphysis...
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