Ellipsoid Joints

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We may say that the joint is a point where two or more things are connected. In the human body, a joint is a place where two bones are connected. A joint means a junction or in other words, it is a strong connection that connects the bones and cartilage together. Joint is necessary for all the movement of the body like walking, running, and shaking hands. The force generated by the muscle is used to carry out movements through various joints. The ease and degree of movement at different joints vary depending on the different factors.


Types of Joints

Joints are classified into different types based on motion, structure and function, some of them are mentioned below:

  • Hinge Joints

  • Saddle Joints

  • Fibrous Joints

  • Gliding Joints

  • Pivotal Joints

  • Synovial Joints

  • Condyloid Joints

  • Cartilaginous Joints

  • Ball and Socket Joints

What are Ellipsoid Joints?

The ellipsoid joint is a type of synovial joint and it is one of the most important types of the joint and it is also called the curved joint. The ellipsoid joint can also be referred to as a condyloid joint or condylar joint. Some of the ellipsoid joint examples are the wrist-joint, metacarpophalangeal joints, metatarsophalangeal joints, and atlanto occipital joints.


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Diagram of an ellipsoid joint of the wrist.


Features of Ellipsoid Joints 

Some of the important features of ellipsoid joints are;

  • It is a biaxial joint.

  • It allows the movement of the bones in all the angular motion. 

  • This joint can have movement in two plains, back and front and side to side. 

  • According to the ellipsoid joint definition, They are usually present in between the knuckle joints, wrist joints, metacarpophalangeal joints, and metatarsophalangeal joints of fingers.

Synovial Joint

This is one of the most usable and most common kinds of joint, which is found in between the bones that move against each other. A synovial joint is also called diarthrosis, joints cartilage or bones with a fibrous joint. These joints allow bones to rotate around each other and slide past each other. The synovial joint has a joint cavity filled with fluid, together with muscles, ligament, tendons, and the capsule which keeps the bones of the joint in place. This arrangement allows movement of the joints. The membrane that lines up the capsule produces oily synovial fluid and lubricates the joint, reducing friction and wear and tear. 


Structural Features of Synovial Joints

These joints are explained by the presence of a joint cavity and their walls are formed by articular capsules. Synovial joints are more complex than the other types of joint and their structural components include. 

  • Synovial fluid 

  • Articular capsule 

  • Articular cartilage 

  • Reinforcing ligaments 

  • Joint cavity or capsules 

Types of Synovial Joints 

Synovial joints are also called diarthrosis joints and almost all the joints present in our body are synovial joints. There are almost six different kinds of synovial joint and mainly classified based on their shapes of the articulating surface of bones that form each other. 


Plane joints 

Plane joints are also known as gliding joints or arthrodial joints. Plane joints allow sliding and gliding movements that the articular surfaces of the bones are flat meaning they only allow movement to occur in uniaxial joints. 

E.g. are present between ankle joints and carpals of the wrist that produce different types of movements are:- 

  • Twisting 

  • Back-and-forth 

  • Nonaxial movement

Hinge Joints 

Hinge joints are the types of joints with cylindrical projections, which nearly resembles the hinge of a door or a window. These are uniaxial joints with a single plane motion that permit extension. 

The hinge is located in the elbow.


Pivot Joints 

Pivot joints are also known as a trochoid joint, rotary joint, in vertebrate anatomy, a freely movable joint that allows only rotational movement around a single axis. The moving bones rotate within a ring that is formed from an adjoining ligament and second bone.

An example of pivot joints is the first and second bones of the neck which allows the head to move back and forth. 

Joint of the wrist, that allows the palm to move.


Saddle Joints 

A saddle joint is a joint with a concave or convex surface that provides a biaxial movement which is similar to condyloid joints. saddle joints are present between the carpometacarpal joints of the thumb.


Ball-and-Socket Joints

The joints with a hemispherical or spherical head in which a bone forms a joint with a cuplike socket. It provides multiaxial joints, and this is one of the most freely moving synovial joints with the highest degree of motion. These joints are present between the shoulder and hip.


Interesting Facts About Ellipsoid Joints

  • The ellipsoid joint found in the base of the index finger enables bending and extending of the joints. 

  • As the ellipsoid joint has two sides of motion, it allows opposite movement of the bone but only for a small or certain extent. 

  • An ellipsoid joint is a type of movable synovial joint, so the ellipsoid joint is also a movable joint.   

FAQ (Frequently Asked Questions)

1. What is Special About Synovial Joints?

Answer. It is a type of joint found between bones that moves against each other. Synovial joints are usable and movable joints. They have fluid between the joint cavity which reduces friction and shock. 

2. What are the Different Types of Synovial Joints?

Anser. The different types of synovial joints are ball and socket joint, hinge joint, pivot joint, gliding joint, saddle joint, condyloid joint, plane joint. 

3. Is the Ankle an Ellipsoid Joint?

Answer. Yes, the ankle is an ellipsoid joint, as the intervertebral joint is a type of ellipsoidal joint as many of the small bones of the wrist and ankle also meet the gliding joint. The oval shape of the condyle fits into the elliptical cavity of the other bone is found in the ankle. 

4. What are Ellipsoid Joints?

Answer. It is an ovoid articular surface, or condyle that it received in the elliptical cavity. 

The ellipsoid joint permits the movement of the bone in two planes, allowing flexion, extension, adduction, abduction, and circumduction.