Joints and Movement

Question 1

How are bones linked?

Answer 1

Bones are LINKED together by ligaments + tendons.

Question 2

What’s the difference between ligaments and tendons?

Answer 2

• Ligaments = attach bone to bone (end of muscles)

- Tendons = move joints

Question 3

What is meniscus?

Answer 3

A cushion between 2 bones.

Question 4

What are the 3 mobilities of joints?

Answer 4

• Fixed joints: no movement (ex: cranium)
• Semi movable: attached but slightly movable (ex: vertebrae)
• Freely movable:
  
  • Type 1: Move only 1 way (ex: elbow (hinge joint)
  • Type 2: All directions (ex: hip (ball + socket)

Question 5

What are the 3 mobilities of joints?

Answer 5

• Fixed joints: no movement (ex: cranium)
• Semi movable: attached but slightly movable (ex: vertebrae)
• Freely movable:
  
  • Type 1: Move only 1 way (ex: elbow (hinge joint)
  • Type 2: All directions (ex: hip (ball + socket)

Question 6

What are the 3 mechanics of joints?

Answer 6

Flexion/Extension:
- Flexion = bending a limb (reduction of the angle)
- Extension= straightening a limb (an increase of the angle)
Abduction/Adduction:
- Abduction = limb moving towards the body
- Adduction = limb moving away from the body
Rotation
- Rotation = Circular movement around an axis

Question 7

Give 3 examples of links and guiding in the human body.

Answer 7

Certain links allow certain movements:

1) Rotational = (Hip Joint → ball + socket)
2) Wheel + axle
3) Partial rotation hinge (Elbow)