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.
Inferior clunial nerve: This nerve branches from the posterior cutaneous nerve of the thigh to the inferior border of the gluteus maximus. It also supplies the skin over the buttocks. Sciatic nerve (L4âS3): This nerve branches from the sacral plexus and passes through the greater sciatic foramen to enter the gluteal region. From there it traverses underneath the biceps femoris and splits into the tibial and common fibular nerves at the knee. It innervates the muscles of the posterior thigh. The sciatic nerve is the longest and widest nerve in the human body and can quite literally cause a pain in the butt when itâs compressed by a herniated disc or sometimes by the piriformis muscle.