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Douglas R. Anderson, MD; William F. Hoyt, MD

Arch Ophthalmol. 1969;82(4):506-530.

Abstract
Optic nerve ultrastructure was studied in nine humans and 11 monkeys. Unmyelinated nerve fibers, belonging to the peripheral nervous system, lie in the adventitia of the central retinal artery, but all axons of the optic nerve itself are myelinated. The ultrastructure of axons and glial cells is the same as elsewhere in the central nervous system. Astrocyte cell bodies and processes insinuate themselves among the nerve fibers and nerve fiber bundles. An astroglial layer lines all the neuroectodermal surfaces that abut upon connective tissue, such as the pia mater, the adventitia of the central retinal vessels, and the septa. Blood vessels are confined to the connective tissue of the septa and the pia mater. The vessels are mainly capillaries with nonfenestrated endothelium. Adjacent endothelial cells seem to be held together by zonulae occludentes (tight junctions).

Author Affiliations
San Francisco

From the Francis I. Proctor Foundation for Research in Ophthalmology, and the Department of Ophthalmology, University of California, San Francisco Medical Center, San Francisco. Dr. Anderson is now at the Bascom Palmer Eye Institute, Miami.

Footnotes
Submitted for publication Sept 18, 1968.

Reprint requests to Bascom Palmer Eye Institute, PO Box 875, Biscayne Annex, Miami 33152 (Dr. Anderson).

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