Peripheral nerve block that numbs the lower leg by targeting the sciatic nerve at the popliteal fossa?

• A. GCS (Glasgow Coma Scale)
• B. Pan Scan
• C. Popliteal block
• D. EKG (Electrocardiogram)

Answer: (C)

The key idea is how a targeted peripheral nerve block works to anesthetize a specific region. A popliteal block places local anesthetic around the sciatic nerve as it lies in the popliteal fossa behind the knee. By blocking conduction there, the tibial and common peroneal branches distal to that point are numbed, giving anesthesia to most of the lower leg and the foot—useful for foot or ankle procedures. The thigh remains unaffected because its innervation comes from nerves higher up, not at the knee.

The other options don’t fit because they refer to different tests or procedures: a Glasgow Coma Scale assesses consciousness, a Pan Scan is a full-body CT for trauma, and an EKG records heart electrical activity.