The physiology of the semicircular canals was my main research interest
before I began to study their morphology. In 1966, by utilizing the
isolated semicircular canal of the frog, I was able to show that cell
activity in the horizontal semicircular canal has the opposite polarity
to that in the vertical canals, which was the first physiological proof
of Ewald's law. Several transmitting electron microscope (TEM) studies
had already reported on the morphology of the semicircular canal
cristae; however, my morphological work was motivated by a strong desire
to see whether the morphological polarity accorded to the physio-
logical polarity. In 1968 I happened to see the paper written by Dr
David Lim, one of my close friends. His findings concerning the
vestibular morphology, when examined by scanning electron microscopy
(SEM), fascinated me a great deal because of the three-dimensional
quality of the micro- graphs. This stimulated me to become involved in
vestibular morphol- ogy. In the beginning, however, I faced many
problems with specimen preparation for SEM, and the first few years were
spent simply solving technical problems, especially those of artifacts.
Many of the figures in this book have been photographed with a JEOL JSM
U-3 scanning electron microscope over a decade. The sharpness of these
pictures still, I think, bears comparison to the defi- nition of those
taken by the more sophisticated SEM scopes currently available.