Abstract
Microglia, the brain's resident macrophages, are incredibly plastic and dynamic cells. In this chapter, we aim to describe and classify the many morphological changes they can display in normal development, aging, and disease. Although microglia in healthy adult brain tissue are often ramified with small somas, they can undergo massive and rapid morphological shifts in response to stimuli, becoming amoeboid or hypertrophic. Older animals occasionally contain dystrophic, senescent, and gitter cell-like microglia, and brain injury can be accompanied by an increase in rod cells. By a careful study of microglial morphology, coupled with ultrastructural insights gleaned using electron microscopy, insights can be provided into the functions performed by these various morphological phenotypes.
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