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Joint Classifications

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Introduction

There are three classifications of joints in the human body, they are; the immovable, the slightly movable (amphiarthrosis) and the movable (synovial). The first of the three joint classifications is the immovable joints. The immovable have the least amount of movement possible as stated in their classification's name. The reason the immovable joints have no movement available to them is because; they are in a fixed position to protect vital organs such as; the cranium protecting the brain or the thoracic cage and sternum protecting the heart and lungs. The second of the three joint classifications is the slightly movable joints. The slightly movable joints have a very minimal range of movement available to them. The reason the slightly movable joints have a limited range of movement is attributed to the fibrous tissue or cartilage surrounding the joint. The vertebral column is a slightly movable joint and is built this way to stop us damaging our central nervous system (CNS) by moving in ways the CNS was not built to move in, and thus stopping us from causing out own paralysis or death. The final of the three joint classifications is the movable joints, also known as the synovial joints. ...read more.

Middle

The fourth of the six joints is the condyloid joint. The condyloid joint can be found in the wrists and ankles, it allows flexion and extension but, rotation is limited. The movements available at this joint can be seen when a basketball player is releasing a jump shot and following through with their fingertips. The fifth of the six joints is the saddle joint. The saddle joint can be found in the thumb joint, it allows flexion, extension, adduction, abduction and circumbduction. The movements available at this joint can be seen during, a cycling race where the saddle joint flexes to allow the rider to grip the handlebars correctly to maintain balance. The last of the six joints is the sliding joint. The sliding joint can be found in the wrists and ankles, more specifically the intercarpal and intertarsal joints. The joint does not perform a specific form of movement but, it does allow the carpals of the wrist and ankle to glide/slide over each other. The Skeleton and how it responds to Exercise Short and Long Term The skeleton develops through weight bearing activities. These developments affect not only the bones of the skeleton but also, the cartilage, the ligaments and the tendons. ...read more.

Conclusion

Thickened layers of hyaline cartilage would allow the body to cope with larger amounts of shock and mechanical stress, which if applied to a thinner layer of cartilage could lead to trauma of a bone; in the form of a compact/compound fracture or a hairline fracture. These thickened layers of cartilage help to cushion the vertebrae, improve posture and reduce the pressure on the lumbar of the spine; which bears most of the body's weight. This reduced amount of stress in the lower back will benefit many peoples' not just athletes' lives, as they will be more mobile in older age and less likely to develop posture problems. Also the facet joints between each vertebra are covered in articular cartilage making turning and bending forwards and backwards a smoother action as the cartilage reduces friction and stops the bones from grinding away at each other. In the long run the thicker the layers of cartilage between the facet joints, the longer the amount of time a person will go without lower back pain. ?? ?? ?? ?? 24th September 09 Unit 1: The Body in Action Campbell McGuire Written Report ...read more.

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