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(Investigative Ophthalmology and Visual Science. 1972;11:980-988.)
© 1972 by The Association for Research in Vision and Ophthalmology, Inc.

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Morphology of the Primate Optic Nerve

I. Method and Total Fiber Count

ALBERT M. POTTS 1, DONALD HODGES 1, C. B. SHELMAN 1, KARL J. FRITZ 1, NORMAN S. LEVY 1, and YVONNE MANGNALL 1

1 Department of Ophthalmology, The Eye Research Laboratories, University of Chicago, 950 E. 59th St., Chicago, Ill. 60637

A method has been devised for counting and size determination of all the fibers in an optic nerve cross-section. The method employs flying spot scanning of a series of 600 to 700 35 mm. negatives which in composite represent the complete cross-section of the optic nerve. The results of absolute counts on two human and two rhesus monkey optic nerves are reported here. These results show that only the highest figures reported by others in the past on the basis of sampling are the correct figures. The number of fibers in the rhesus optic nerve is in the range of 1.5 to 1.8 million. The corresponding figure for the human lies between 1.1 and 1.3 million. Both the modest variability between individuals, and the larger number of fibers in the monkey than in the human appear to be real. Size information will be presented in a subsequent publication.

Key Words: optic nerve fibers • fiber counts • automation • flying spot scanner • epon sections • Rhesus • human

Submitted on July 28, 1972
Accepted on September 8, 1972




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