The term "spinal marrow" is commonly used to refer to the spinal cord, which is a long, thin, cylindrical bundle of nerve fibers that runs from the brainstem down through the center of the back. There are several synonyms that can be used to describe this important part of the nervous system, including spinal column, vertebral column, and backbone. Other terms that may be used include neural axis, medulla spinalis, and spinal cord proper. Regardless of the term used, the spinal cord plays a critical role in transmitting signals between the brain and the rest of the body, and is essential for movement, sensation, and other bodily functions.