In the axoneme of cilium, the pair of central microtubules are connected to peripheral to peripheral microtubules (doublet) by

Options

A. Axial spoke
B. Radial spoke
C. Linkers
D. Inter doublet bridge

Answer

To solve the question regarding the connection between the central microtubules and the peripheral microtubules in the axoneme of a cilium, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Cilium**:
- A cilium is a hair-like structure that extends from the surface of a cell and is involved in locomotion and movement. It consists of a specific arrangement of microtubules.

2. **Identify the Components**:
- The axoneme of a cilium typically has a "9+2" arrangement of microtubules. This means there are 9 peripheral doublet microtubules surrounding 2 central microtubules.

3. **Determine the Connections**:
- The question asks how the central microtubules are connected to the peripheral doublet microtubules.

4. **Evaluate the Options**:
- The options provided are:
- Axial spoke
- Radial spoke
- Linkers
- Inter doublet bridge

5. **Identify the Correct Connection**:
- The correct connection between the central microtubules and the peripheral doublets is made by **radial spokes**. These radial spokes extend from the peripheral doublets to the central microtubules, providing structural support and facilitating movement.

6. **Conclusion**:
- Therefore, the answer to the question is **radial spoke**.

### Final Answer:
The pair of central microtubules in the axoneme of a cilium are connected to the peripheral doublet microtubules by **radial spokes**.

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