Psychobiology · 6 min
Neuron and glia: a living system, not a solitary cell
Why the brain cannot be understood by studying neurons alone, and what different glial cells do.
A neuron specialises in receiving, processing and transmitting signals. But it does not work in isolation: its nutrition, protection, chemical environment and impulse conduction speed depend on glial cells.
Four important roles of glia
- Astrocytes maintain chemical balance and contribute to synaptic function.
- Oligodendrocytes in the CNS and Schwann cells in the PNS form myelin.
- Microglia provide immune surveillance and remove damaged elements.
- Ependymal cells are involved in cerebrospinal fluid circulation.
The central idea
The brain is not simply neuronal wiring but a dynamic ecosystem. Behaviour emerges from the interaction of cells, molecules, experience and environment.
Glossary
Mini-test
1. Why should neurons not be understood in isolation from glia?
2. What is the main role of astrocytes?
3. How are oligodendrocytes and myelin related?
4. What is a key role of microglia?
Discussion question
If neurons depend on constant support from glia, how accurate is it to think of the brain mainly as a network of neurons?
Study note. This material does not replace professional medical advice.