Final answer:
Spinal anesthesia involves the injection of anesthetic into the spinal canal, resulting in a loss of sensation and motor function below the level of injection. It is commonly used for various surgical procedures.
Step-by-step explanation:
Spinal anesthesia is a type of anesthesia that involves the injection of anesthetic into the spinal canal, specifically the subarachnoid space. This differs from epidural anesthesia, which involves the injection of anesthetic into the epidural space. Therefore, option b) is correct. Spinal anesthesia can result in a loss of sensation and motor function below the level of injection, making option c) true. It is commonly used for a variety of surgical procedures, including orthopedic, urologic, and gynecologic surgeries, making option d) true as well.