Joints

Question 1

What are the 6 types of joints

Answer 1

• Hinge
  
  • Pivot
  • ball and socket
  • Ellipsoid
  • Saddle
  • Plane

Question 2

Describe the movement of the Hinge joint

Answer 2

It Can only move on a single axis. The Hinge joint is used for Flexion and extension

Question 3

What are the notable Hinge joints

Answer 3

knees and elbows

Question 4

Describe how the pivot joints at the ends the the lower arm work

Answer 4

The radius bone has a cylindrical cap that allows it to fit in the ulnar bone with ligaments attaching it. the cap rotates inside the ulnar and there is a similar but reversed(the radius has the notch while ulnar has the cap, and no ligament). this allows the radius to rotate around the ulnar while the ulnar and the top part of the radius stay completely in place. This joint is called the radio-ulnar joint. It allows for pronation (the hand is facing up and the two bones are parallel) and supination(The hand is facing downward and the radius is crossed over the ulnar)

Question 5

How can the ball and socket joint move

Answer 5

The ball and socket uses all movements, Flexion/extension, adduction/ abduction, rotation, circumduction(all the other movements in circular motion)

Question 6

Where are the ball and socket joints

Answer 6

The hips and shoulders

Question 7

Why are dislocated shoulder more common the dislocated hips?

Answer 7

The shoulders have a shallower ball and socket joint so they can have greater range of motion, but the hip bones are designed for stability not range.

Question 8

How can the ellipsoid joint move

Answer 8

the ellipsoid joint allows for flexion/extension, adduction/abduction and circumduction, the ball slides into the center during abduction.
However it cannot rotate

Question 9

What are some ellipsoid joints

Answer 9

The radio-carpal joint(The wrist), and The joint connecting the clavicle to the manubrium

Question 10

What movements can the saddle joint make

Answer 10

The saddle joint allows for flexion/extension, adduction, abduction, circumduction and slight rotation

Question 11

Where are the saddle joint

Answer 11

There are saddle joints in the thumb.

Question 12

Describe the movements of the plane joints

Answer 12

The plane joint can Glide or rotate. They usually come in groups, like in the wrists and feet