Joints Flashcards
Joints are usually categorized by their Range of Motion. What are the 3 functional categories that joints fall under? What does each name signify?
- Synarthrosis - No Movement
2.Amphiarthrosis - Little Movement
3.Diarthrosis - Wide Range of motion
Give example(s) of bones that would fall under each category with their associated joints:
1. Synarthrosis
2.Amphiarthrosis
3.Diarthrosis
- Skull joints
- Collarbone
- the elbow, the knee, the ankle, shoulder
Joints that have the greatest range of motion and are typically found on the ends of long bones?
Synovial Joints
The connection between the ends of the first pair of ribs to the sternum is classified as what type of joint?
A Cartilaginous -> Synchondrosis
An example of where we would find a symphysis in the body?
The pubic symphasis
What is a joint?
It is where two bones interconnect
Synovial Fluid aid in keeping articular cartilage from touching, what other functions does it serve?
- Lubrication for reducing friction
- Nutrient Distribution by continuously circulating and getting rid of waste
- Shock Absorption by distributing compression forces to joint capsule
What happens when excessive force is applied to a joint? Explain
When excessive force is applied to a joint it will cause a dislocation, which is articulating surfaces forced out of position.
The greater range of motion for a joint, the weaker it is and it is susceptible to dislocation if there is movement beyond the normal range of motion.
Outline the 4 types of motion that is permitted by synovial joints:
- Gliding: Moving in one plane along two axes
- Angular Motion: movement along two axes in one plane
- Circumduction: Proximal end remains fixed while the distal end moves in a circle
- Rotation: Shaft rotates while the bone remains fixed
Compare and Contrast Flexion and Extension:
Where would we see this in the body?
Both will be applied to movements along the long bones however flexion will reduce the angle between two articulating points while extension will increase the angle.
At bending and extending of antebrachium
You have been called to the whiteboard in geometry class, and told to draw a circle, 1 foot in diameter, on the board. What movement would you be doing with your arm to draw the circle?
Circumduction
The structures that pass across or around a joint, limiting range of motion and providing support, are __________.
Tendons
Which joint results from the fusion of two bones?
Synostosis
A freely movable diarthrotic joint is always what type of structural joint?
Synovial
Hip fractures are common in elderly population, why is that?
The weight distribution is not aligned along the shaft of the femur q
