Final answer:
The procedure of injecting medication into the epidural space of the spine for regional anesthesia is known as an epidural block. Therefore correct option is E
Step-by-step explanation:
The procedure that involves regional anesthesia through the injection of medication into the epidural space of the spine is known as an epidural block. This type of anesthesia is often used during labor and childbirth to provide pain relief, as well as during certain surgical procedures where it is beneficial to numb a large region of the body without affecting the patient's consciousness. An epidural block is different from a spinal block, which involves injecting medication directly into the cerebrospinal fluid surrounding the spinal cord.