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.
Place the probe transversely at the knee crease in the popliteal fossa. Locate the popliteal artery and vein. Check the compressibility of the popliteal vein throughout the popliteal fossa. Be cautious not to mistake the often prominant muscular veins (gastrocnemius veins) for the popliteal vein. Whislt not truely deep veins they are generally large and still pose a lesser risk of embolisation. As such, you should also examine these as possible causes of the patient's symptoms.