This course offers a comprehensive overview of the three fundamental components of general anesthesia: narcosis, which reduces patient stress by inducing sleep; myorelaxation, which provides complete muscle relaxation required for precise surgical procedures; and analgesia, which blocks pain by rendering the animal insensitive to incisions. Collectively, these components create a safe and effective surgical environment. Each section examines the body's adverse reflexes in response to surgical manipulations, including their classification, prevention, and the application of the three effects of general anesthesia.