The muscle bundles in the body wall of aschelminthes termed

Options

A. triads
B. aponeurosis
C. quandrants
D. fasciculi

Answer

### Step-by-Step Solution

1. **Understanding Aschelminthes**: Aschelminthes, also known as pseudocoelomates, are a group of invertebrates characterized by having a body cavity that is not completely lined by mesoderm. This body cavity is referred to as a pseudocoel.

2. **Body Wall Structure**: The body wall of Aschelminthes is composed of multiple layers. Specifically, it has four layers: the inner layer is the endoderm, followed by a pseudocoel, then the mesoderm, and finally the outer ectoderm.

3. **Muscle Bundles**: The muscle bundles present in the body wall of Aschelminthes are specifically termed "quadrants." This term reflects the four layers present in their body structure.

4. **Comparison with Other Terms**:
- **Triads**: This term refers to a structure in human muscle tissue and is not applicable to Aschelminthes.
- **Aponeurosis**: This is a type of fibrous tissue found in mammals, not in Aschelminthes.
- **Fasciculi**: This term refers to bundles of muscle fibers, which is also not relevant to the classification of muscle bundles in Aschelminthes.

5. **Conclusion**: Therefore, the correct term for the muscle bundles in the body wall of Aschelminthes is "quadrants."