The first part of this investigation, which dealt with the peripheral nervous system in the mucous membrane of the human larynx, was published recently in these Archives.20 In this study, human larynges from different age groups and both sexes were submitted to serial sections, which were stained with a modification of Bodian's method. For details of the procedure and findings, and for pertinent references, the reader is directed to this recent article. Concepts of Muscle Innervation Since the discovery of motor end-plates by Doyère, in 1840, the subject of muscle in