• Joints are places where two or more bones meet.
• There are three main types of joints present in our body.
• Fixed joints do not allow any movement.
• The joints between the bones of our skull are examples of fixed joints.
Freely movable joints:
• Freely movable joints can move quite freely and allow a variety of movements.
Examples: elbow and knee joints.
Slightly movable joints:
• Slightly movable joints allow very little movement.
Ex: joints between most vertebrae.
• The four major movable joints present in our body are:
Ball and socket joint:
• In this type of joint, the ball like surface of one bone fits into a cup-like hollow in the other.
Ex: Joints at the hips and the shoulder.
Hip joint Shoulder joint
• In this type of joint, the rounded surface of one bone fits into a ring formed by the other, such that one bone is able to rotate over the other.
Eg: Joint where the neck joins the head.
• This kind of joint provides back and forth movement similar to the hinges of a door.
E.g.: Joints at the knee and the elbow.
Knee joint Elbow joint
• This kind of joint allows bones to glide over each other, providing little movement in all directions.
E.g.: Joints at the ankle and the wrist.
Ankle joint Wrist joint