Your spinal cord is a slender nerve column that goes from your brain to your vertebral column. It starts with the foramen magnum and has 31 segments (vertebrae).
There are 8 cervical vertebrae, which control nerve impulses in your upper limbs. There are 12 thoracic and 5 lumbar vertebrae, which control the nerve impulses in your upper limbs. There are also 5 sacral and finally 1 coccygeal vertebraes