Spinal anesthesia is a method of partially anesthetizing the spine
by injecting anesthetic into the spinal canal, specifically the meninges near the spinal column. The anesthetic acts directly on the marrow of the spinal cord
, putting the nerves from the injection site downwards to "sleep". Depending on the type of procedure required, spinal anesthesia can be performed on different sections of the spinal column, relatively high for operations involving the head, more often in the lumbar vertebra
for operations involving the lower limbs. Spinal anesthesia is usually performed for fairly short surgeries, typically lasting less than 2 hours, performed on the lower part of the body. It is notably performed in the fields of urology
, proctology, and gynecology.