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.
Sciatica Symptoms. Sciatica is a term for pain that radiates along the sciatic nerve, anywhere from the lower back, buttocks, down the back of the leg, to the foot. There may also be weakness, numbness, tingling, particularly in the leg and/or foot.ciatica refers to pain along the path of the sciatica nerve. It is usually caused by pressure on the sciatic nerve. Fortunately, most cases of sciatica are not serious and usually resolve within six weeks.