Why it is important that bones are jointed together.
What kind of joints there are.
How freely movable joints work.
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Joints
Joints are responsible for 2 main purposes of the skeleton: making you a solid being and making you move. There are different kinds of joints. Characterized by their build and ability to move.
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Suture
When you were a baby, you had independent skull plates, which have grown together. This was done by sutures; a joint where the fontanelles are being kept together by a fibrous material.
Sutures don't have the ability to move.
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Fused bones
Some bones also fused into each other during your lifetime, this happens with your sacrum for example.
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Cartilous joint
Between your ribs and breastbones you can find a cartilous joint; a joint made out of cartilage. There is ''some'' movement possible within these joints.
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Synovial joints
Synovial joints are in some way freely movable. There are present in all the parts of your body that you move. While there are different synovial joints; there all have the same parts (figure 4.30).
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Synovial joints
The main purpose of these parts is to make sure your bones stay together, and they don't damage each other.
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Synovial joints
You have three types of synovial joints:
- Pivot joints (torn over each other)
- Ball-and-socket joints (can move in all axis)
- Hinge joints (goes up and down)
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Homework
The homework for next lesson will be the exercises of paragraph 4.4. You can start to work on them now.
Lesson duration is: 60 min
