A 45-year-old man undergoes surgical exploration of the popliteal fossa for removal of a thrombosed popliteal artery aneurysm. During dissection, the surgeon must carefully identify and preserve the tibial nerve. Which of the following statements correctly describes the anatomical relationship of the tibial nerve within the popliteal fossa?

Explanation

## Anatomical Position of Tibial Nerve in Popliteal Fossa The popliteal fossa contains three main neurovascular structures arranged in a specific anatomical relationship: ### Layers (Superficial to Deep): 1. **Popliteal vein** — lies most superficially 2. **Popliteal artery** — lies deep to the vein 3. **Tibial nerve** — lies deepest, posterior to both vessels ### Medial-Lateral Arrangement: - **Medial**: Tibial nerve (most medial) - **Central**: Popliteal artery - **Lateral**: Common peroneal nerve (runs along lateral border) ### Clinical Significance: The tibial nerve's deep and medial position makes it vulnerable during surgical procedures in the popliteal fossa. During aneurysm repair or vascular surgery, careful dissection is required to avoid iatrogenic nerve injury, which would result in loss of ankle plantarflexion and toe flexion. **Key Point:** The mnemonic for popliteal fossa contents from superficial to deep is **VAT** (Vein, Artery, Tibial nerve), with the tibial nerve being the deepest and most medial structure. **High-Yield Fact:** The common peroneal nerve diverges from the sciatic nerve at the superior border of the popliteal fossa and runs along the lateral margin, making it the most lateral neurovascular element.