Viral and bacterial pathogens that have invaded the central nervous system can be cleared through the activity of specialized supporting cells known as

The specialized supporting cells known as "microglia" are responsible for clearing viral and bacterial pathogens that have invaded the central nervous system.

Here are the steps:

1. Invasion: Viral and bacterial pathogens invade the central nervous system. This can occur through various routes, such as through the bloodstream or by direct invasion into the brain or spinal cord.

2. Detection: Microglia, the resident immune cells of the central nervous system, detect these foreign invaders. They can recognize pathogens through various receptors that can bind to specific structures on the surface of the pathogens.

3. Activation: Upon detection of the pathogens, the microglia become activated. This involves changes in their morphology and function. They become more mobile and start to produce substances that can fight off the invaders, such as reactive oxygen species and nitric oxide.

4. Phagocytosis: The activated microglia then engulf the pathogens in a process called phagocytosis. This involves the microglia surrounding the pathogen and enclosing it within a part of their cell membrane. The pathogen is then trapped inside a vesicle within the microglia.

5. Destruction: Inside the microglia, the vesicle containing the pathogen fuses with a lysosome, which is an organelle that contains digestive enzymes. These enzymes break down the pathogen, effectively destroying it.

6. Clearance: The remnants of the destroyed pathogen are then cleared away by the microglia. This helps to maintain the health and function of the central nervous system.

In this way, microglia play a crucial role in defending the central nervous system against viral and bacterial pathogens.