Page 2 - 2. Lesson Notes-Joints

• Hinge joint allows movement in only two directions-
❖ backward and forward
❖ upward and downward
• It can also be said that the movement is allowed only in one plane.
• It provides more movement than just back and forth swing.
• It also allows some rotation.
• This joint is present in –elbow, knee, and fingers.
2. Ball and socket joint

• A ball and socket are one in which the end of one bone is round like a ball
that fits into a cup-like cavity or socket of the other bone.
• This arrangement allows movement in all direction-
▪ Forward and backward
▪ Side to side
• Example-1 The joint between the upper arm and the shoulder is a ball and
socket joint. The round bone of the humerus bone fits into the socket of the
shoulder bone. That is why we can move our hands in all directions.
• Example-2 The joint between the hip bone and the femur.
3. Pivot joint

• In the pivot joint, the end of one bone is in the form of a cylinder.
• The end of the other bone is in the form of a ring.
• The cylinder fits into the ring and rotates inside it, or the ring rotates around
the cylinder.
• It is present in our neck.
• We can bend our neck, right and left, upward and downward, and rotate it.

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