CNS Neuroglial Cells• Greatly outnumber neurons in the CNS

(think worker ants vs. Queen ant)1. Microglial cells– Scattered throughout CNS– Support neurons and phagocytize bacterial cells

and cellular debris

2. Oligodendrocytes– Occur in rows along nerve fibers– Provide layers of myelin around axons within

brain and spinal cord

CNS Neuroglial Cells, continued….

3. Astrocytes– Found between neurons and blood vessels– Provide structural support, help regulate

nutrients and ions in tissues– Form scar tissue to fill spaces after CNS injuries

4. Ependymal cells– Form epithelial-like membrane in parts of the

brain (choroid plexuses)– Form inner linings that enclose ventricles in the

brain and central canal in the spinal cord

CNS Neuroglial Cells

PNS Neuroglial cells

1. Schwann cells: form myelin sheath around axons