How Is The Nervous System Organized?

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For all vertebrate and many invertebrate animals, the nervous system can be divided into the central nervous system (CNS) and peripheral nervous system (PNS). The vertebrate CNS consists of the brain and the spinal cord. Both structures are bilaterally symmetrical; the two sides of the brain are referred as two hemispheres. 

 vertebrate = an animal having a backbone 

invertebrate = any animal with no backbone, for example a worm 

backbone = the row of small bones that are connected together down the middle of the back (SYN spine) 

spinal cord = the mass of nerves inside the spine that connects all parts of the body to the brain 

bilateral = involving both of two parts or sides of the body or brain 

hemisphere = either half of the brain 

cerebral = relating to the brain 

cervical = relating to the neck 

thoracic =  connected with a person's thorax (= the part of the body that is surrounded by the ribs, between the neck and the waist) 

lumbar = relating to the lower part of the back 

sacral = related to a bone in the lower back, between the two hip bones of the pelvis 

pelvis = the wide curved set of bones at the bottom of the body that the legs and spine are connected to 

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