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Painkilling medication has been administered into the cerebrospinal fluid in your back.

The vertebrae form the vertebral canal on the rear of the spinal column. The spinal cord runs in the vertebral canal. Nerve fibers run from the brain into the body via the spinal cord and form nerves there. Every nerve is responsible for a particular part of the skin and for certain muscles. These nerves are important for instance in enabling you to feel and move the muscles.

Cerebrospinal fluid is a clear fluid that is formed in the brain. There are cavities with cerebrospinal fluid in the brain, around the brain and around the spinal cord. Among other things, the cerebrospinal fluid cushions the brain and spinal cord during knocks and also nourishes the brain cells. If medication is administered into the cerebrospinal fluid, problems in specific areas of the body can be treated as a result.

Your skin was pricked with a needle so that the medication would be delivered in the right place. The needle was inserted into a particular place in your back. The medication can then be injected through the needle itself or a drip can be attached.