where does the sciatic nerve start and end
Sciatic nerve The sciatic nerve (/saɪˈætɪk/; also called ischiadic nerve, ischiatic nerve) is a large nerve in humans and other animals. It begins in the lower back and runs through the buttock and down the lower limb. It is the longest and widest single nerve in the human body, going from the top of the leg to the foot on the posterior aspect.[1] The sciatic nerve provides the connection to the nervous system for nearly the whole of the skin of the leg, the muscles of the back of the thigh, and those of the leg and foot. It is derived from spinal nerves L4 to S3. It contains fibers from both the anterior and posterior divisions of the lumbosacral plexus.
Ventral root of spinal nerve In anatomy and neurology, the ventral root or anterior root is the efferent motor root of a spinal nerve.
Vein Veins are less muscular than arteries and are often closer to the skin. There are valves in most veins to prevent backflow.
Electrocardiography Leads I, II and III are called the limb leads. The electrodes that form these signals are located on the limbs â€“ one on each arm and one on the left leg.[25][26][27] The limb leads form the points of what is known as Einthoven's triangle.[28]