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.
License Image >>. ++<<Next >>. The sciatic nerve is the largest nerve in the body and arises from the L4 through S3 spinal nerves (and their roots). It exits the pelvis through the sciatic notch, and continues down the back of the thigh where it splits into the common fibular and tibial nerve at the knee. The common fibular and tibial nerves and their branches continue downward to innervate the lower leg and foot. Sciatica refers to the symptoms of pain, numbness, tingling, burning sensation or weakness that originate in the lower back, radiate through the buttock, and continue down the back of the thigh, leg and foot.