The author reviewed the available literatures up to 1960 dealing with the problem of peripheral innervation of the larynx. Since the end of the 19th century, numerous observations and thesis have been accumulated on the problem, which is not completely solved even in the present time. The author divided the problem as follows and discussed in each chapter, viz., bulbar roots of the laryngeal nerves, the recurrent laryngeal nerve and its fibre distribution with respect to the proprioception of the larynx, the superior laryngeal nerve, Galen's loop, vegetative innervation of the larynx and nerve endings in the larynx. The author suggested that the difference in species can not be too emphasized. It was also suggested that the problem should always be investigated from both anatomical and physiological standpoints.
Using rhinomanometer the air current passage in the nose of 1, 336 human subjects was studied and basic figures of expiration were decided. Clinical appliance revealed that regular oval figures were normal and irregular figures with marginal defect were abnormal being encountered in cases with nasal diseases. The figures in the latter were divided into 5 basic types and these in turn could be divided into numerous intermediate types. The present method is applicable in the younger age group, since it is not accompanied by any pain. The therapeutic effect can be determined by comparing the figures of expiration before and after operation making it easier to establish a more scientific therapeutic measure.
According to Denkel, during expiration air passes through the common nasal passage. However, the present author through his studies on rhinometry and expiration figures applying rhinomanometer has obtained some different interesting findings; after all nasal passages were plugged with gauze tamponade, both figures of expiration and obstruction were obtained. It may thus be said that air can pass through any passage, and that the concept of Denkel is a mistake.