The ventral diaphragm of cockroach is present in between

Options

A. Thorax and abdomen
B. Pericardial and perivisceral sinuses
C. perivisceral and Perineural sinuses
D. Pericardial and Perineural sinuses

Answer

To solve the question regarding the location of the ventral diaphragm in a cockroach, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Structure of the Cockroach**:
- The cockroach has a complex body structure, including a haemocyl that extends from the anterior (front) to the posterior (back) end.

2. **Identifying the Sinuses**:
- The haemocyl consists of several sinuses, which are large spaces filled with hemolymph (the blood equivalent in insects). The main sinuses in the cockroach include the perivisceral sinus and the perineural sinus.

3. **Defining the Diaphragms**:
- There are two main diaphragms in the cockroach: the dorsal diaphragm and the ventral diaphragm. The ventral diaphragm is a muscular membrane that separates different sinuses.

4. **Locating the Ventral Diaphragm**:
- The ventral diaphragm is specifically located between the perivisceral sinus (which surrounds the visceral organs) and the perineural sinus (which surrounds the nerve cord).

5. **Choosing the Correct Answer**:
- Based on the above information, the correct answer to the question is that the ventral diaphragm of the cockroach is present between the perivisceral and perineural sinuses.

### Final Answer:
The ventral diaphragm of the cockroach is present between the perivisceral and perineural sinuses.

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