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Glial and Mobile Cells in the Iris of the Aging Human Eye

  • Carlo A. P. Cavallotti
  • Angelica Cerulli
Part of the Aging Medicine book series (AGME)

Abstract

This chapter describes the glial and mobile cells that can be found in the iris of the aging human eye. The glial cells of the eye can be divided in two principle classes: Macroglia and Microglia.

The Macroglia is of neuroectodermic origin and includes olygodendrocytes, Schwann cells, and astrocytes. Macroglia contains cells that regulate the neuronal metabolism and modulate neuronal functions. Moreover, macroglia regulates also the eye blood vessels functions. In the eye bulb, two cell types can be found as part of the macroglia: Müller cells and astrocytes.

Microglial cells are similar to the tissue macrophages. These cells are normally resting, but are sensitive to the pathological changes in the homeostasis of the various components of the eye. When the eye tissues undergo pathological changes, the microglial cells rapidly change into phagocytes capable of mobility. Moreover, the eye contains some types of cells, nonstructurally connected with the other, adjacent cells by mean of junctions, capability of migration, mobility, production of cytochines, and phagocytosis. These cells are named mobile or floating cells. Finally, endothelial cells and pericytes can be found in the eye, which flank the nerve cells and glial cells, or arrange themselves around the blood vessel walls. All these cells show strong age-related changes.

Keywords

human eye iris macroglia microglia astrocytes floating cells phagocytes-Lymphocytes 

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Copyright information

© Humana Press, a part of Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Carlo A. P. Cavallotti
    • 1
  • Angelica Cerulli
    • 2
  1. 1.European Ophthalmic Neuroscience Program (Local Research Unit)University of Rome “La Sapienza,”RomeItaly
  2. 2.Department of OphthalmologyUniversity of Rome “Tor Vergata,”RomeItaly

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