Step 1: Understanding the Concept: 
The question requires identifying which of the listed anatomical structures does not belong to the female reproductive system. This requires basic knowledge of human reproductive anatomy. 
Step 2: Detailed Explanation: 
- Fallopian tubes: These are tubes that connect the ovaries to the uterus, where fertilization typically occurs. They are part of the female system. 
- Uterus: A muscular organ where a fertilized egg implants and the fetus develops. It is a central part of the female system. 
- Ovaries: The female gonads that produce eggs (ova) and hormones like estrogen. They are a core part of the female system. 
- Vas efferens (or efferent ductules): These are a series of small tubes that connect the rete testis to the epididymis. They are involved in transporting sperm and are part of the male reproductive system. 
Step 3: Final Answer: 
Fallopian tubes, uterus, and ovaries are parts of the female reproductive system. The Vas efferens is a part of the male reproductive system.