Which of the following structural order of ganglion are correctly represented in cockroaches ?

Options

A. Supra- pharyngeal ganglion, supra- oesophageal ganglion , sub - oesophageal , prothoracic ganglion , meta - thoracic ganglion , meta - thoracic ganglion , meso thoracic ganglion , 1- 6 abdominal ganglion.
B. Sub- pharyngeal ganglion, supra- oesophageal ganglion , meta - thoracic ganglion , meso - thoracic ganglion , pro - thoracic ganglion , 1- 6 abdominal ganglion.
C. Sub - oesophageal ganglion , supra - oesophageal , meso - thoracic ganglion , pro - thoracic ganglion , pro thoracic ganglion , meta - thoracic ganglion , 1 - 6 abdominal ganglion.
D. Supra - oesophageal ganglion , sub - oesophageal , pro - thoracic ganglion meso - thoracic ganglion , meta - thoracic ganglion , 1 - 6 abdominal ganglion

Answer

To solve the question regarding the structural order of ganglia in cockroaches, we will analyze the options provided and determine which one correctly represents the sequence of ganglia.

### Step-by-Step Solution:

1. **Understanding Cockroach Nervous System**:
- The nervous system of a cockroach is divided into several ganglia, which are clusters of nerve cell bodies. The main components include the supraesophageal ganglion, subesophageal ganglion, thoracic ganglia (prothoracic, mesothoracic, metathoracic), and abdominal ganglia.

2. **Identifying the Correct Order**:
- The correct order of ganglia in cockroaches is:
- Supraesophageal Ganglion
- Subesophageal Ganglion
- Prothoracic Ganglion
- Mesothoracic Ganglion
- Metathoracic Ganglion
- Abdominal Ganglia (1 to 6)

3. **Evaluating Each Option**:
- **Option 1**: Supraesophageal, Sub-esophageal, Prothoracic, Metathoracic, Mesothoracic, 1-6 Abdominal Ganglion
- This option is incorrect because the order of thoracic ganglia is not correct.
- **Option 2**: Subpharyngeal Ganglion, Supraesophageal Ganglion, Metathoracic Ganglion, Mesothoracic Ganglion, Prothoracic Ganglion, 1 to 6 Abdominal Ganglion
- This option is incorrect as it misplaces the ganglia.
- **Option 3**: Subesophageal Ganglion, Supraesophageal, Mesothoracic Ganglion, Prothoracic Ganglion, Metathoracic Ganglion, 1 to 6 Abdominal Ganglion
- This option is incorrect due to the incorrect sequence of ganglia.
- **Option 4**: Supraesophageal Ganglion, Subesophageal Ganglion, Prothoracic Ganglion, Mesothoracic Ganglion, Metathoracic Ganglion, 1 to 6 Abdominal Ganglion
- This option is correct as it follows the proper order.

4. **Conclusion**:
- The correct answer is **Option 4**: Supraesophageal Ganglion, Subesophageal Ganglion, Prothoracic Ganglion, Mesothoracic Ganglion, Metathoracic Ganglion, 1 to 6 Abdominal Ganglion.