Three types of joints?

(1) Fibrous joints, also known as immovable joints, are connected by dense fibrous connective tissue between the two bones and have no mobility. For example, the skull is composed of 8 lentils, the edges of which are like serrate, interlaced and chimeric with each other, separated by periosteum in the middle, and combined into a whole piece, which can not move at all; If the tooth is inserted into the alveolar, it is also included in this category.

(2) Cartilage joint is also known as fretting joint. Joints are connected by cartilage and have only partial motion. For example, the spine is composed of pieces of vertebrae. Between the two vertebrae, there is a ring of cartilage, and then they are tied together by a kind of elastic "rope" -- ligament, so that our head, neck, chest and waist can bend around and rotate, but the range of movement between the articular surface is small.

(3) synovial joint is also called movable joint. This type of joint has no articular disc, or only a residual cartilage plate to fill the surface irregularities and control the flow of synovial fluid. It has obvious joint cavity, cavity wall with synovial membrane, synovial fluid as the lubricant of joint. These joints have a wide range of motion. This includes the joints of the limbs and most joints in the human body. Such synovial joints are a common site for arthritis

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