The spinal cord itself is about 45 cm (18 in) in men and 43 cm (17 in) long in women. The human spine is composed of 33 vertebrae that interlock with each other to form the spinal column. Synopsis: Information and pictures of the spine and spinal cord showing C1 to S5 vertebra and which vertebra effect various body functions. On This Page: Summary - Main Article - About/Author