Male sex accessory ducts include all of the following structures except

Options

A. Seminiferous tubule
B. Rete testis
C. Vasa efferentia
D. Vasa deferens

Answer

To solve the question regarding the male sex accessory ducts, we need to identify which of the given structures is not classified as an accessory duct.

### Step-by-Step Solution:

1. **Identify the Structures Listed**: The question lists the following structures:
- Seminiferous tubule
- Retetestis
- Vasa efferentia
- Vasa deferens

2. **Understand the Function of Each Structure**:
- **Seminiferous Tubule**: This is where sperm is produced. It is not an accessory duct but rather the site of spermatogenesis.
- **Retetestis**: This structure collects sperm from the seminiferous tubules and is considered an accessory duct.
- **Vasa Efferentia**: These ducts transport sperm from the retetestis to the epididymis and are classified as accessory ducts.
- **Vasa Deferens**: This duct carries sperm from the epididymis to the urethra and is also an accessory duct.

3. **Determine Which Structure is Not an Accessory Duct**:
- The only structure among the options that does not serve as an accessory duct is the **seminiferous tubule**.

4. **Conclusion**: Therefore, the answer to the question is that male sex accessory ducts include all of the following structures except the **seminiferous tubule**.

### Final Answer:
**Seminiferous tubule**