On sensory innervation of larynx in dog

Abstract

The mucous membrane of larynx in dog is smaller and simpler than in man in scale. The epithelium is either stratified flat or multi-lined ciliated, the major part of larynx being covered by the former and pars intercartilaginea and pars inferior laryngis only being surfaced by the latter type of epithelium. The height of epithelium is lower than that of man. These facts suggest the lower stage of development of nerves, especially sensory nerves in this part, in dog than in man. The nerves supplyint the laryngeal mucous membrane are originated in n. laryngicus cranialis of n. vagus and truncus sympathicus cervicalis. The former consists of thick sensory fibres and fine parasympathetic fibres, which divide into small bundles upon reaching to basis of epiglottis. The majority of nerves for epiglottis run over the laryngeal side, only a small minority going to the pharyngeal side. The former penetrate the small pores of cartilago epiglottidis and pass into plexus submucosus and plexus tunicae propriae, latter also pass into both plexus, but their development is very inferior. These plexuses are much more backward in development than those in adult human larynx (Sasaki), resembling more those in tenth month embryo (Momono). © 1953, Tohoku University Medical Press. All rights reserved.