The cells that primarily provide support and protection to neurons in the nervous system are Glial cells.

- Glial cells are non-neuronal cells that play a crucial role in maintaining the homeostasis of the nervous system, providing structural support, insulating neurons, supplying nutrients, and protecting neurons from injury or infection.
- Unlike neurons, glial cells do not conduct electrical impulses but are essential for the proper functioning of the nervous system.

Here is a brief overview of the options:
1. Schwann cells – These are a specific type of glial cell found in the peripheral nervous system (PNS). Their primary role is to form the myelin sheath around peripheral nerve fibers, facilitating faster nerve impulse conduction, but they are a subset of glial cells rather than a broad category.

2. Glial cells – This is the general term for support cells in both the central nervous system (CNS) and PNS, which include astrocytes, oligodendrocytes, Schwann cells, microglia, and satellite cells. Thus, they encompass all support and protective functions across the nervous system.

3. Satellite cells – These are glial cells located in the PNS that specifically surround and protect neuron cell bodies within ganglia, offering localized support.

4. Microglia – These are the resident immune cells of the CNS that act by engulfing debris and pathogens to protect neurons from infections and damage.

In summary, glial cells as a whole provide comprehensive support and protection to neurons, making Option 2: Glial cells the correct answer.

Reference: Neuroscience, 6th Edition, Chapter 2: Cellular Components of the Nervous System / Page 45-50