The joint in which the round end of one bone is fixed into the cavity of the other bone is called and socket joint. Ball and socket joint allows movement of bones in all directions (360˚). Example - Joint between shoulder and upper arm or joint between hip and upper leg.

Ball and socket joint is a movable joint . It has rounded end of one bone fits into the cavity of other bone .
Ex : Shoulder bone

Ball and Socket Joint
A ball and socket joint is a type of synovial joint in which the rounded head of one bone fits into the concave socket of another bone, allowing for a wide range of motion in multiple directions.

Location in the Body
The ball and socket joint is found in the human body at the hip and shoulder joints.

Hip Joint
- The hip joint consists of the rounded head of the femur (thigh bone) fitting into the acetabulum of the pelvis.
- This joint allows for movements like flexion, extension, abduction, adduction, and rotation of the hip.

Shoulder Joint
- The shoulder joint is formed by the head of the humerus (upper arm bone) articulating with the glenoid cavity of the scapula (shoulder blade).
- This joint allows for movements in all directions, including flexion, extension, abduction, adduction, internal rotation, and external rotation of the shoulder.

Functionality
- The ball and socket joint provides stability and a wide range of motion to the hip and shoulder joints, allowing for various activities like walking, running, swimming, throwing, and reaching.

Key Points
- Ball and socket joints are the most mobile type of joint in the body.
- These joints are surrounded by a synovial capsule that helps lubricate the joint for smooth movement.
- Ligaments and muscles provide additional support to these joints to prevent dislocation and injury.