شرح الجزء الأول من المفاصل Joints ♥️❤️👌. скачать в хорошем качестве

شرح الجزء الأول من المفاصل Joints ♥️❤️👌.

Joints are the structures that connect bones in the body, allowing for movement and providing stability. There are several types of joints: 1. *Fibrous Joints:* These are immovable joints, like the sutures between the bones of the skull. 2. *Cartilaginous Joints:* These allow limited movement and are found in areas like the spine. 3. *Synovial Joints:* These are the most common type and allow for free movement, such as the knee, elbow, and shoulder joints. They have a cavity filled with synovial fluid, which reduces friction and facilitates smooth movement. Joints vary in their range of motion and stability depending on their location and function in the body.Cartilaginous joints are a type of joint where the bones are connected by cartilage, allowing for limited movement. There are two main types of cartilaginous joints: 1. *Synchondroses:* These joints are connected by hyaline cartilage and are typically immovable or allow very little movement. An example of a synchondrosis is the joint between the first rib and the sternum. In children, the growth plates (epiphyseal plates) in long bones are also synchondroses, which allow for bone growth until they ossify and become solid bone. 2. *Symphyses:* These joints are connected by fibrocartilage, which is a tough, elastic type of cartilage that allows for some movement and acts as a shock absorber. Examples of symphyses include the intervertebral discs between the vertebrae in the spine and the pubic symphysis in the pelvis. Cartilaginous joints are designed to provide strength and slight flexibility, making them crucial for areas of the body that need both stability and some degree of movement, such as the spine and the pelvis.Fibrous joints are a type of joint where bones are connected by dense connective tissue, primarily composed of collagen. These joints are typically immovable or allow very limited movement. There are three main types of fibrous joints: 1. *Sutures:* Found between the bones of the skull, sutures are immovable joints that are only present in the skull. The edges of the bones interlock and are bound together by a minimal amount of fibrous tissue, providing stability and protection to the brain. 2. *Syndesmoses:* In these joints, bones are connected by a ligament or an interosseous membrane, allowing for a slight degree of movement. An example is the distal joint between the tibia and fibula in the leg. 3. *Gomphoses:* This type of fibrous joint occurs between a tooth and its socket in the jawbone. The tooth is held in place by the periodontal ligament, allowing for a very slight movement, which is necessary to absorb the forces of chewing. Fibrous joints are designed for stability and protection, rather than movement.