Human Body System
- The introduction
- The main parts of the nervous system The nervous system consists of two main parts. The central nervous system and the peripheral nervous system. The central nervous system is made up of the brain and spinal cord. In most animal species it consists of two main parts, the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS contains the brain and spinal cord. The PNS consists mainly ofnerves, which are enclosed bundles of the long fibers or axons, that connect the CNS to every other part of the body.
- The nervous system consists of the brain, spinal cord, sensory organs, and all of the nerves that connect these organs with the rest of the body. Together, these organs are responsible for the control of the body and communication among its parts.
- CNS is composed of the brain (located in the cranial cavity) and the spinal cord (located in the vertebral cavity), which serve as the main control centers for all body activities.
Diseases or disorders
- Brain and nervous system problems are common. These neurological disorders include multiple sclerosis, Alzheimer's disease, Parkinson's disease, epilepsy, and stroke, and can affect memory and ability to perform daily activities.
- The human nervous system is divided into two parts, the central nervous system and the peripheral nervous system.
- A baby's brain consists of around 10 million nerve cells at it's time of birth.
- Humans on average use only four percent of the cells in their brains at any one time.
- The adult brain consists 100 billion neurons.
- Our bodies contain 43 nerve pairs which connect the central nervous system to the rest of our body. Twelve pairs connected to the brain and 31 pairs connect to our spinal chord.