7 Things You Probably Didn't Know About The Spinal Cord

1. The brain and spinal cord together make up the central nervous system (CNS).
2.  It is around 45 cm (18 in) in men and around 43 cm (17 in) long in women.
3. The spinal cord is divided into four different regions: the cervical, thoracic, lumbar and sacral regions
4. The human spinal cord is divided into 31 different segments.
5. The spinal cord is supplied with blood by three arteries that run along its length starting in the brain, and many arteries that approach it through the sides of the spinal column. 
6. The two areas of the spinal cord most commonly injured are the cervical spine and the lumbar spine. 
7. The spinal cord is the most important structure between the body and the brain. 

Source: wikipedia.org