Abstract
An Optomax Image Analyzer was used to carry out fiber-size analyses in 6 pairs of human recurrent laryngeal nerve and 2 pairs of recurrent nerves from adult giraffes. In every case the left recurrent laryngeal nerve contained a greater number of large, fast-conducting fibers. Since this nerve is longer than the right, the findings may explain the simultaneous arrival of motor impulses to both sides of the laryngeal musculature.

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