![]() ![]() Occlusion of the Eustachian tube leads to the development of middle ear inflammation ( otitis media ). ![]() The function of this tube is to protect, aerate and drain the middle ear (and mastoid). Their possible role in primate tubal function is minimal at best. Auditory tube: The tube that runs from the middle ear to the pharynx, also known as the Eustachian tube. The auditory tube relationships of the salpingopharyngeus, levator veli palatini, and internal pterygoid muscles are described. The muscle has an inferior attachment to the posterior hard palate and thus possesses a vector directed inferolaterally contraction would appear to pull the membranous wall inferiorly and laterally, resulting in tubal dilation. The muscle is attached to the lateral membranous tubal wall along its extrabullar extension. The tensor veli palatini muscle appears to be the only muscle to act directly on the tube and effect tubal dilation. Although the direct application of morphologic data to account for the observed function of a system is a tenous one, the data on the rhesus monkey auditory tube appear to be consistent with those published for other mammals. Auditory tube diverticula, also known as guttural pouches, are naturally occurring dilations of the auditory tube in horses that communicate with the nasopharynx through a small ostium. The importance of these in infective pathology in the region is emphasized. The communication of the nasopharynx with the auditory tube and the relationships of the aggregations of lymphatic tissue are described. This study was undertaken to define the anatomical characteristic of the system in the rhesus monkey (Macaca mulatta) and to determine the limits on the use of the monkey as a model of human tubal function. The relationships of the naso- and oropharynx are described together with the muscular wall of the pharynx. An extensive search of the literature has indicated little detailed information on the primate tube/middle ear system. The middle ear is part of a functional system composed of the nasopharynx and the eustachian tube (anteriorly) and the mastoid air cells (posteriorly). The primate nasopharynx-auditory tube-middle ear complex is being used by several researchers to model both normal and pathologic functions of the human auditory tube. ![]()
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