____________ are characterized by the presence of a fluid filled cavity between the articulating surfaces of the two bones.

Options

A. Fibrous joint
B. Synovial joints
C. Cartilagenous joints
D. Hinge joints

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about a type of joint characterized by the presence of a fluid-filled cavity between the articulating surfaces of two bones.

2. **Identifying Joint Types**: There are several types of joints in the human body:
- **Fibrous Joints**: These joints are connected by dense connective tissue and do not have a fluid-filled cavity.
- **Cartilaginous Joints**: These joints are connected by cartilage and also do not have a fluid-filled cavity.
- **Synovial Joints**: These joints are characterized by the presence of a synovial cavity filled with synovial fluid, which allows for movement between the articulating bones.
- **Hinged Joints**: This is a specific type of synovial joint that allows movement in one plane, like a door hinge.

3. **Analyzing the Options**:
- **Fibrous Joint**: No fluid-filled cavity.
- **Synovial Joint**: Yes, it has a fluid-filled cavity.
- **Cartilaginous Joint**: No fluid-filled cavity.
- **Hinged Joint**: While it is a type of synovial joint, it does not specifically refer to the general characteristic of having a fluid-filled cavity.

4. **Conclusion**: The only type of joint that is characterized by the presence of a fluid-filled cavity between the articulating surfaces of two bones is the **synovial joint**.

5. **Final Answer**: The answer to the question is **synovial joint**.

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