Hexacanth of Taenia reaches heart of pig through vein

Options

A. Post caval vein
B. Renal vein
C. Hepatic vein
D. Precaval vein

Answer

To solve the question regarding how the hexacanth of Taenia reaches the heart of a pig, we can break down the process step by step:

### Step-by-Step Solution:

1. **Understanding Hexacanth Larvae**: The hexacanth larvae is the larval stage of the Taenia tapeworm. It is important to know that this larvae is typically found in the tissues of the intermediate host, which in this case is the pig.

2. **Entry into the Host**: The hexacanth larvae enter the pig's body through ingestion of contaminated food or water. Once inside, they migrate to the bloodstream.

3. **Hepatic Portal Vein**: After entering the bloodstream, the hexacanth larvae travel through the hepatic portal vein. This vein carries blood from the gastrointestinal tract and spleen to the liver.

4. **Liver Processing**: Upon reaching the liver, the larvae may undergo further development. The liver is a key organ for processing nutrients and pathogens.

5. **Postcaval Vein**: After the liver, the hexacanth larvae exit through the postcaval vein (also known as the inferior vena cava). This vein collects deoxygenated blood from the lower body and returns it to the heart.

6. **Reaching the Heart**: The hexacanth larvae then travel through the postcaval vein to reach the heart of the pig.

7. **Final Destination**: From the heart, the larvae can then spread to various tissues, including voluntary muscles, where they can continue their life cycle.

### Conclusion:
The hexacanth of Taenia reaches the heart of the pig through the **postcaval vein**.