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Harvey A. Swadlow, PhD; Stephen G. Waxman, MD, PhD; Norman Geschwind, MD

Arch Neurol. 1980;37(2):114-115.

Abstract
• The splenium of the corpus callosum of a primate (Macaca mulatta), examined with the electron microscope, was found to contain both myelinated and nonmyelinated axons. The majority of nonmyelinated axons had diameters of less than 0.25 µ. On the basis of this diameter distribution, it is expected that many callosal axons conduct impulses at velocities of less than 1 m/s and that interhemispheric conduction times for some callosal axons are at least 30 ms and possibly much longer.

Author Affiliations
From the Department of Psychology, University of Connecticut, Storrs, and the Department of Neurology, Harvard Medical School, Boston (Dr Swadlow); the Department of Neurology, Stanford (Calif) University Medical School, and the Veterans Administration Hospital, Palo Alto (Dr Waxman); and the Department of Neurology, Harvard Medical School, and Beth Israel Hospital, Boston (Dr Geschwind).

Footnotes
Accepted for publication Jan 29, 1979.

Reprint requests to Department of Psychology, U-20, University of Connecticut, Storrs, CT 06268 (Dr Swadlow).

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