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.
Location. The sciatic nerve is the largest single nerve in the body. It begins in the lower part of the back and runs through the hip/buttock region, giving off two branches; the articular branch, which provides nerve function to the hip-joint, and the muscular branch, which extends into the muscles of the thigh.