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.
What is sciatica? Sciatica is leg pain caused by a pinched nerve in the lower back. Although the pangs begin in nerve roots located on either side of the lower spine, they then course through the sciatic nerve, which runs the length of each leg from the buttock down to the foot.