Page 3 - 2. Lesson Notes-Joints

4. Gliding joint

• This kind of joint allows bones to glide over one another and provides a
sliding movement.
• These bones have flat ends and can move from side to side as well as back
and forth.
• Present in the ankle, wrist, as well as the joint between the vertebrae.
FIXED JOINT
• This type of joint cannot move.
• The bones in our head that protects our brain is a fixed joint.

• The upper jaw and rest of the head are joined by a fixed joint.

MOVEMENTS OF BONES

• Bone cannot move by themselves.
• Muscles make the bone move and help in body movement.
• Tendon is the tissue that attaches muscles to the bone.

• Muscles work in pairs to produce the movements - one muscle contracts to
pull the bone in one direction and the other muscle contracts to pull the
bone in the opposite direction.

• Muscles can pull the bone but cannot push them. Therefore, muscle work in
pair to product movement.
• Flexor- the muscle that contracts to pull the tendon to bend a joint.
• Extensor- When flexor muscle relaxes, extensor muscle pulls another
tendon to straighten the same joint.
• Flexor and extensor are a pair of muscles that work together.

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