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 sciatic nerve is the longest nerve in the body, going from the pelvis, through the buttocks, down the legs to the feet. Having a prolapsed disc (also known as a ' slipped disc') in the back is a most common cause of sciatica, but sometimes doctors do not find an obvious cause of the pain.