The sciatic nerve is the largest and longest nerve in the body with a diameter of almost 2cm. It starts from a network of nerves in the pelvis region, branching out down into each of the legs.
The sciatic nerve carries out two basic functions, namely motor (movement) functions and sensory (feeling) functions. When the nerve is compressed, the symptoms are called sciatica. Aside from sharp shooting pain, symptoms such as loss of reflexes, weakness and numbness are often present when both its motor and sensory functions are imparied.