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Joints are formed between the ends of two articulating bones. Based on the anatomy of joints they are classified as synarthrodial and synovial joints. Joints can also be classified based on the degree of freedom of movement as an immovable, slightly movable, and freely movable joint. In this video, we will talk about two classification criteria of the joints in detail. ▬ Joint Classification ▬▬▬▬▬▬▬▬▬▬ Joints are structures in the body that allow movement between bones. They are formed where two or more bones meet and are held together by ligaments, which are strong bands of connective tissue. In other words, a Joint is a junction between two or more bones or cartilages. 👉 Ligament A ligament is a thick band of connective tissue. It is attached from one bone to the other. They ensure the stability of a joint and restrict any excessive movement at the articulation of bone. 👉 Tendon A tendon is also a thick band of fibrous connective tissue, but it attaches a muscle to a bone. Its main function is the transmission of force from muscle, to perform the movement at the joint. ▬ Structural Classification ▬▬▬▬▬▬▬▬▬▬ According to the structural classification of joints, there are two types of joints. 🔹Synarthroses 🔹Diarthroses 👉 Synarthroses These are the joints that do not have joint cavities and are immovable or slightly mobile joints. They are further subtypes of these joints. ✧ Fibrous Joints ✧ Cartilaginous Joints Check out the video to go through the details of these joints. 👉 Diarthroses These are the joints that do have a cavity. They are commonly known as synovial joints. Unlike the synarthrodial joints, they allow a variety of movement The three types of movement that occur at these joints are: ✦ Gliding Movement ✦ Angular Movement ✦ Rotatory Movement ✦ Circumduction The synovial joint is further classified based on ▪️Complexity of the joint ▪️Degree of freedom of movement ▪️Shape of the articulating bone ▬ Functional Classification ▬▬▬▬▬▬▬▬▬▬ Functional classification of joints is based on the degree of movement that the joint allows. According to the functional classification of joints, there are three types of joints: 👉 Immovable Joints These are the joints that do not allow any movement once the articulation of bones occurs. Examples of immovable joints are 🟡 Sutures 🟡 Gomphoses 👉 Slightly Movable Joints These are the joints that allow some movement. They are also known as amphiarthroses. Examples: 🟠 Pubic symphysis 🟠 Joints between intervertebral discs 👉 Freely Movable Joints These are the joints that allow free movement around three principal axes. Synovial joints are freely movable joints. Examples: 🔵 Shoulder joint 🔵 Knee joint 🔵 Hip joint