is a bundle of nerve tissue, which through the center of the spinal column runs. The spinal cord conducts information between the brains and the rest of the body via 31 pairs of nerves to the spinal cord and spring to all parts of the body.

The nerves leave the spinal canal through the intervertebral holes. Each nerve enters into two branches out: a front (motor root) and a posterior (sensory root).

The spinal cord has a diameter of about 0,5 inche and average 20 inche long (from the brainstem to the cauda equina). The sensory roots guiding information from other parts of the body to the brains and motor roots from the brains by giving incentives to the muscles.


Man Gay sapiens or a bipedal primate species in the family Hominidae. Research suggests that modern humans about 200,000 years ago in Africa emerged as a species. Humans have highly developed brains, which he is capable of abstract thinking, language, introspection, problem solving and emotion. Thanks to his intelligence and upright posture, allowing the arms to be free to pick up objects and manipulate, the man much more than other species able to use tools.