Nervus ischiadicus, also known as the sciatic nerve, is a long nerve that runs from the lower back down to the feet. Synonyms for the sciatic nerve include ischiatic nerve, ischionerve, ischial nerve, and nervus ischiadici. Other related terms include lumbar-sacral plexus, sacral nerves, and gluteal nerves. These terms refer to other parts of the nervous system that are connected to the sciatic nerve and are involved in the movement and sensation of the lower body. Knowing these synonyms and related terms can help in understanding the anatomy and function of the sciatic nerve and related structures.