Please choose the correct ending to complete the given sentence: Health: [header] How to fight cervical spinal stenosis [title] Understand the condition. [step] Cervical spinal stenosis is the narrowing of the spinal canal in the neck. [substeps] The spinal canal is the open area in the central part of the bones (vertebrae) that make up the spinal column.

Ending1: The central part is where the bones connect to the spine or the spinal column that the spine attaches to. The spine is also the separating point for the vertebrae. Ending2: It's usually located about the same spot as pituitary sphincter vessels. The narrowing of the spine can be severe or even fatal and requires immediate medical treatment. Ending3: This area is difficult to see and is difficult to camouflage by keeping eyeglasses on during the day. Sometimes when faced with these conditions, blood is drawn and pulled from the neck to create a block in the spine that forces blood to travel to the spinal canal. Ending4: The spinal cord is a collection of nerves that runs through the spinal canal from the base of the brain to the lower back. These nerves allow us to feel, to move, and to control the bowel and bladder and other body functions.

Answer format: ending1/ending2/ending3/ending4