A characteristic of ganglia is

Options

A. Hollow cluster of nervous tissue
B. Nervous tissue devoid of tissue sheath
C. Solid cluster of nervous tissue surrounded by tissue sheath
D. Found inside the central nervous system.

Answer

### Step-by-Step Solution:

1. **Understanding Ganglia**:
- Ganglia are clusters of interconnecting neurons or nerve cells. They are primarily found in the peripheral nervous system (PNS), which is outside the brain and spinal cord.

2. **Structure of Ganglia**:
- Ganglia consist of a solid cluster of nervous tissue. This tissue is not hollow; it is made up of neuron cell bodies, dendrites (the processes of neurons), and supporting cells known as satellite glial cells.

3. **Role of Satellite Glial Cells**:
- Satellite glial cells are important as they provide support and protection for the nerve cell bodies within the ganglia. They line the external surface of the nerve cells in the PNS.

4. **Location of Ganglia**:
- It is crucial to note that ganglia are not part of the central nervous system (CNS), which consists of the brain and spinal cord. Instead, they serve as intermediate structures that connect the CNS to the PNS.

5. **Evaluating Options**:
- Based on the characteristics of ganglia, we can evaluate the options provided in the question. The correct characteristic of ganglia is that they are solid clusters of nervous tissue surrounded by a tissue sheath.

6. **Conclusion**:
- Thus, the correct answer to the question regarding the characteristic of ganglia is option number three, which states that ganglia are solid clusters of nervous tissue surrounded by a tissue sheath.