Central nervous system
The central nervous system includes brain and spinal cord. The brain plays a central role in the control of most body functions and uses 20 percent of the total oxygen we breathe in. The brain consists of an estimated 100 billion neurons, with each connected to thousands more. The brain can be divided into four main lobes: temporal, parietal, occipital and frontal. The spinal cord is an elongated cylindrical structure, about 45 cm (18 inches) long that extends from the medulla oblongata to a level between the first and second lumbar vertebrae of the backbone.
- Track 1-1 Cranial nerves
- Track 2-2 Central glial cells
- Track 3-3 Bacterial meningitis
- Track 4-4 Viral encephalitis
- Track 5-5 Brain tumor
- Track 6-6 Multiple sclerosis