Anatomy Paper - Daniel Kelleher Joints Anatomy Paper...

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Daniel Kelleher Anatomy Paper Joints December 5, 2010 Joints allow for the movements and actions you see professional athletes make every day on TV. These great athletes would not be able to run or make different movements without the functions of joints. Joints or articulations are the sites where two or more bones meet. Joints have two fundamental functions which consist of giving our skeleton mobility and a protective role in the process. Joints are the weakest parts of the skeleton but their structure resists crushing or tearing. Joints are classified by their structure and function they serve. The structures of joints consist of fibrous, cartilaginous and synovial joints. The functional classification is based on the amount of movement allowed at the joint. The function classifications are synarthroses (immovable joints), amphiarthroses (slightly movable joints) and diarthroses (freely movable joints). Immovable and slightly movable joints are largely restricted to the axial skeleton. This localization of functional joint types is understandable because the less movable the joint, the more stable it is. In general, fibrous joints are immovable, and synovial joints are freely movable. However, cartilaginous joints have both rigid and slightly movable examples. Fibrous joints are when bones are joined by fibrous tissue and no joint cavity is present. The amount of movement allowed depends on the length of the connective tissue fiber uniting the bones. The three types of fibrous joints are sutures, syndesmoses, gomphoses and most fibrous joints are immovable. Sutures occur only between bones of the skull and look like “seams”. Sutures are held together with very short, interconnecting fibers, and bone edges interlock. The immovable nature of sutures is a protective adaption because movement of the cranial bones would damage the brain. Syndesmoses are when bones are connected exclusively by ligaments cords or band of fibrous tissue. The connecting fibers vary quite a bit in length but are always longer than those in sutures. The length of the connecting fibers determine the amount of movement allowed. Gomphosis is a peg-in-socket fibrous joint and the only example is the articulation of a tooth with its bony
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Anatomy Paper - Daniel Kelleher Joints Anatomy Paper...

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