3.5.1 Ball and socket joint

Last updated at June 28, 2026 by

๐Ÿ’ฌ Think about it

Swing your arm in a full circle. Almost no other joint lets you do that. What kind of joint gives the shoulder such freedom? Let us see.

What is a ball and socket joint?
  • The rounded top of the upper arm bone fits into a hollow of the shoulder bone.
  • This forms the ball and socket joint.
  • It allows forward, backward, sideways and circular movement.
  • The shoulder and collarbone form the shoulder girdle.
Important Points
  • A ball and socket joint has a rounded bone fitting into a hollow.
  • It allows movement in all directions.
  • The shoulder is a ball and socket joint.
โ“ Test Yourself
  1. Which joint allows the arm to move in all directions?
    View Answer Hide Answer
    The ball and socket joint.
  2. Where is a ball and socket joint found?
    View Answer Hide Answer
    At the shoulder (and the hip).
Important Definitions
  • Ball and socket joint — a joint where a rounded bone fits into a hollow, allowing movement in all directions.
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