Back to Top. Empiricism is the theory that the origin of all knowledge is sense experience. It emphasizes the role of experience and evidence, especially sensory perception, in the formation of ideas, and argues that the only knowledge humans can have is a posteriori (i.e. based on experience).
Answer: The sciatic nerve divides into the tibial and common peroneal nerves at the lower third of the thigh. When an injection is done in the popliteal fossa space, the provider should indicate what structure he or she is trying to block.
The arteries and veins. The arteries that are found in the popliteal fossa provide blood to structures of the knee, and they also take blood down to the ankle and foot. Following are the arteries that run through the popliteal fossa: 1  Popliteal artery: This artery continues from the femoral artery at the adductor hiatus, which is a gap between the adductor magnus muscle of the thigh and the femur. It runs down into the popliteal fossa and divides into the tibial arteries.