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Science 1 January 1965:
Vol. 147. no. 3653, pp. 57 - 59
DOI: 10.1126/science.147.3653.57
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Articles

Foveal Receptors of the Monkey Retina: Fine Structure

John E. Dowling 1

1 Alan C. Woods Research Building, The Wilmer Institute, Johns Hopkins Hospital, Baltimore, Maryland 21205

The outer segments of the foveal cones of the rhesus monkey are about 40 microns long and 0.9 microns wide. They consist of stacks of membrane-limited, transverse discs about 140 Å thick, surrounded by a plasma membrane. The inner segments are about 30 microns long and 2.5 to 3 microns wide at the base, and they taper gradually to a tip diameter of about 1.5 microns. They contain many long mitochondria which are oriented length-wise and are concentrated in the distal portion of the segment. The terminal pedicles show many synaptic contacts, probably as many as 36 per pedicle.


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