Choroid plexus is a network of

Options

A. Nerves
B. Capillaries
C. Muscle fibres
D. Lymph vessels

Answer

### Step-by-Step Solution:

1. **Understanding the Choroid Plexus**:
- The choroid plexus is a structure in the brain that plays a crucial role in the production of cerebrospinal fluid (CSF).

2. **Identifying the Composition**:
- The choroid plexus is primarily made up of a network of capillaries. These capillaries are small blood vessels that facilitate the exchange of substances between the blood and the surrounding tissues.

3. **Specialized Cells**:
- In addition to capillaries, the choroid plexus also contains specialized ependymal cells. These cells line the ventricles of the brain and are involved in the production and regulation of cerebrospinal fluid.

4. **Location**:
- The choroid plexus is located within the cerebral ventricles, which are fluid-filled spaces in the brain.

5. **Function**:
- The primary function of the choroid plexus is to produce cerebrospinal fluid, which cushions the brain and spinal cord, providing protection against injury and serving as a barrier against toxins.

6. **Conclusion**:
- Based on the above information, the correct answer to the question "Choroid plexus is a network of" is **option B: capillaries**.