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.
Piriformis muscle: Piriformis is a small muscle that is located deep in the buttock region. The sciatic nerve runs through this muscle. This muscle can become tense enough for it to squeeze the Sciatic nerve, producing symptoms including pain and numbness, that travel down the leg from the buttock region.