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The existence of a previously unknown nerve plexus associated with a comparatively large ganglion embedded in the substance of the human temporal bone must be regarded as a somewhat surprising fact at this period in the history of human anatomy. It may be well, therefore, to describe in a few lines the process which led to the discovery. While making some preparations of the middle ear of animals according to my own method, I discovered the presence of a large plexus of nerves on the posterior surface of the bulla of the sheep. This plexus was found to be composed of bundles derived from the pneumo-gastric and the facial nerves. Since the preparation was only macroscopic, I was unable to ascertain whether nerve ganglion cells were present. Such a plexus has not been described in the human subject, unless the two minute bundles of fibres which pass between Arnold’s nerve and the facial nerve be dignified by the name of plexus. It seemed, therefore, highly probable to me that some corresponding structure might exist in the human subject which had not hitherto been described, and a search was accordingly made.

On the occurrence of a ganglion in the human temporal bone not hitherto described