Synovial fluid is present in

Options

A. Spinal cavity
B. Cranial cavity
C. Freely movable joints.
D. Fixed joints.

Answer

**Step-by-Step Solution:**

1. **Understanding Synovial Fluid**: Synovial fluid is a viscous fluid found in the cavities of synovial joints. Its primary function is to lubricate the joints, reducing friction during movement.

2. **Identifying Synovial Joints**: Synovial joints are characterized by their ability to allow free movement. Common types of synovial joints include:
- Ball and socket joints (e.g., shoulder and hip joints)
- Hinge joints (e.g., elbow and knee joints)
- Pivot joints (e.g., neck joints)
- Gliding joints (e.g., joints in the wrist)

3. **Exclusion of Other Joint Types**:
- **Fixed Joints**: Also known as fibrous joints, these joints do not contain synovial fluid. They are immovable, such as the joints between the bones of the skull.
- **Cranial and Spinal Cavities**: These cavities do not contain synovial fluid; instead, they are filled with cerebrospinal fluid, which serves a different purpose.

4. **Conclusion**: Since synovial fluid is specifically found in synovial joints, the correct answer to the question is that synovial fluid is present in freely movable joints.

5. **Final Answer**: The correct option is option number 3, which refers to synovial joints.

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