Which of the following muscles forms the adductor hiatus?

Question

BlackTom AI · Accepted Answer

The adductor magnus contains a specialized tendonous gap — the adductor hiatus — through which the femoral vessels pass into the popliteal fossa, so the correct answer is Adductor magnus.

1. Relevant knowledge points and concepts
- The medial thigh muscles include adductor longus, adductor brevis, adductor magnus, and gracilis.  
- The adductor magnus has two distinct parts: an adductor (oblique) portion inserting along the linea aspera, and a hamstring (vertical) portion inserting on the adductor tubercle of the femur.  
- The adductor hiatus is an opening between these two portions/tendinous insertions near the distal femur. The femoral artery and vein pass through this hiatus and become the popliteal vessels.

2. Step-by-step reasoning
- Identify which muscle has two parts that create a gap: adductor magnus is the only adductor with both an adductor and a hamstring portion that meet but leave an interval.  
- Recognize the anatomical role: that interval is the adductor hiatus; it is not a feature of adductor longus, adductor brevis, or gracilis, which have different insertions and do not create a trans-femoral opening.

3. Intermediate anatomical “steps” (no numerical calculation required)
- Adductor magnus adductor part → inserts on linea aspera.  
- Adductor magnus hamstring part → inserts on adductor tubercle.  
- Space between these insertions = adductor hiatus.  
- Femoral artery/vein course: femoral artery in anterior thigh → passes through adductor hiatus → becomes popliteal artery in posterior knee.

4. Why the correct answer is correct
- Only the adductor magnus’s dual-part configuration produces an anatomical hiatus. This precise structural arrangement forms the passage for the femoral vessels.

5. Why the other options are incorrect
- Adductor longus and adductor brevis insert on the linea aspera but are single-part muscles that do not form a hiatus.  
- Gracilis is a long, thin superficial muscle inserting at the pes anserinus on the tibia; it does not create any femoral hiatus.

6. Conclusion
- Therefore, the adductor magnus is the muscle that forms the adductor hiatus. This matches the provided correct answer: Adductor magnus.

Which of the following muscles forms the adductor hiatus?单项选择题

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