Joints are the points where the bones of the skeleton join together. An articulations is another name for a joint. The majority of joints are built in such a way that they can move about. Not all joints, however, allow for mobility. The extent and direction of the movements allowed by joints that do allow movement varies.
Synovial joints, fibrous joints, and cartilaginous joints are the three types of joints. Joints are responsible for allowing movement in many regions of the body. Let’s look at how joints are classified and the anatomy of various types of joints.
Joints
The region of the body where two or more bones unite to facilitate movement is called a joint. Except for the hyoid bone in the throat, every bone in the body connect to at least one other bone at a joint. The function of a joint determine its shape. An articulation is another name for a joint.
In general, the greater the range of motion available through a joint, The greater the risk of damage. This is because a higher range of motion diminishes the joint’s strength.
Classification of Joints
- The range of motion allowed by the joints.
Each of these classes can be subdivided further. Let’s take a look at each category separately.
A] The range of motion allowed by the joint
We can categorize them as follows, depending on the degree of motion allowed by the joint:
Synarthroses or Fixed Joints– The term synarthroses refers to a condition in which the bone are fused together and allow for little or no movement. These are fibrous joint, which means the tissue that connects two bones is ‘fibrous’ in nature. Suture between skull bones are an example of a fixed joint.
Amphiarthroses, or slightly movable joint, is a type of joint that allows for more mobility than a fixed joint. In this type of joint, the binding tissue is cartilaginous. The joints between the intervertebral discs are an example of a slightly movable joint.
Synovial Joint or Freely Moveable Joint– These joint allow for the most movement between the bones involved. They’re also known as diarthroses and they are divided into six categories based on the types of movements they may make.
Types of joint
Joints are classified according to the amount of movement they enable.
Immovable – when two or more bone are in close proximity yet cannot move – such as the bones of the skull. Sutures are the names for the joints in the skull.
The vertebrae of the spine, for example, are slightly moveable because two or more bones are locked together so tightly that only limited movement is allowed.
The majority of joints in the human body are of this type. The aim of the joint is to allow movement.
Cartilaginous joints
Cartilaginous joints are those in which cartilage, either hyaline cartilage or fibrocartilage, completely connects the bones. These joints allow for greater movement than fibrous joints, but less than synovial joints.
Primary Cartilaginous joint
Synchondroses are cartilaginous joints that are fully made up of hyaline cartilage. The majority of them are found between the ossification centers of developing bones and disappear in the mature skeleton, although a few survive into adulthood.
The growth plates between ossification sites in long bones are examples of primary cartilaginous joints in humans. These joints, like those in the spine and ribs, allow for just a little amount of mobility.
Secondary Cartilaginous joint
These are fibrocartilage-based permanent joints known as symphyses. They are called amphiarthroses since they only have a small range of motion and are all situated along the skeletal midline.
The Manubriosternal joint (between the manubrium and the sternum), intervertebral discs, and the pubic symphysis are all examples of secondary cartilaginous joints in human anatomy.
What is two joints in body
Ball-and-socket joints are the most common type of joint.
Hinge joints are a type of hinge joint.
Ball and socket joints
In vertebrate anatomy, a ball-and-socket joint, also known as a spheroidal joint, is a joint in which a bone spherical surface glides within a depression on another bone, enabling greater flexibility of movement than any other type of joint.
Example: This category includes the hip and shoulder joints. Both of these joint types have the problem of being somewhat unstable and coming out of the joint due to their large range of motion.
Hinge joint
A hinge joint is a type of synovial joint found in the body that allow motion in just one direction.
Example: The articulating ends of the bones slot together like a hinge on a door in hinge joints, and movement is limited to flexion and extension. Elbow, knee, and finger joints are examples of hinge joints.
Conclusion
The locations where the bones of the skeleton connect together are known as joints. A joint is also known as an articulation. The majority of joints are constructed in a way that allows them to move around. However, not all joints allow for motion. Joints that do allow movement vary in the amount and direction of movement they allow.
A joint is the part of the body where two or more bones come together to allow movement. Every bone in the body links to at least one other bone at a joint, with the exception of the hyoid bone in the throat. The shape of a joint is determined by its function. A joint is also known as an articulation.
Cartilaginous joints are those in which the bones are fully connected by cartilage, either hyaline cartilage or fibrocartilage. These joints can move more than fibrous joints, but not as much as synovial joints.
Synchondroses are totally hyaline cartilage-covered cartilaginous joints. Although a few survive into adulthood, the majority of them are situated between the ossification center of developing bones and disintegrate in the mature skeleton.
Primary cartilaginous joints in humans are the growth plates between ossification sites in long bones. These joints, like those in the spine and ribs, have a limited range of motion