![]() Their possible role in primate tubal function is minimal at best. The auditory tube is 3,5-4 cm long and around 2 mm in diameter. The auditory tube relationships of the salpingopharyngeus, levator veli palatini, and internal pterygoid muscles are described. The auditory tube (also known as the pharyngotympanic tube, Eustachian tube, Latin: tuba auditiva) is a tunnel that connects the tympanic cavity to the nasopharynx and equalizes pressure on both sides of the tympanic membrane. 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 Eustachian tube (ET), also called auditory tube or pharyngotympanic tube, is part of a system comprising nose, palate, nasopharynx and middle ear. The muscle is attached to the lateral membranous tubal wall along its extrabullar extension. The opening of the auditory tube (which leads to the middle ear) lies on the dorsolateral wall of the nasopharynx. It is approximately 36 mm in length and is directed. Methods: Sonotubometry, tubomanometry, and sonotubome- try with nasopharynx under pressure were performed on a total of 106 ears. An extensive search of the literature has indicated little detailed information on the primate tube/middle ear system. The tensor veli palatini muscle appears to be the only muscle to act directly on the tube and effect tubal dilation. The Eustachian tube is the channel through which the tympanic cavity communicates with the nasopharynx. 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. 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. 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 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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