Texas FFA Livestock Judging PracticeTest

What type of joints in animal skeletons allow movement and contain a fluid-filled cavity?

1. Synarthroses joints

2. Diarthroses joints

3. Amphiarthroses joints

4. Cartilaginous joints

The correct answer is: Diarthroses joints

Diarthroses joints, also known as synovial joints, are characterized by their ability to permit a wide range of motion between bones. These joints contain a fluid-filled cavity called the synovial cavity, which is essential for reducing friction between the articulating surfaces during movement. The synovial fluid within this cavity also acts as a lubricant, providing nourishment to the cartilage that covers the ends of the bones and ensuring smooth movements. These joints are typically found in areas of the body where mobility is crucial, such as the knees, elbows, shoulders, and hips. Their structure includes not only the synovial cavity but also other key components like ligaments, tendons, and a joint capsule, all of which contribute to the joint's stability and range of motion. In contrast, synarthroses joints are immovable, allowing no movement between the bones; amphiarthroses joints allow limited movement; and cartilaginous joints are primarily connected by cartilage and can provide varying degrees of movement but do not have a synovial cavity. Thus, diarthroses joints uniquely facilitate movement through their specialized structure.