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Postnatal Development of the Eustachian Tube Glands

Authors

  • Yorihisa Orita MD,

    1. Elizabeth McCullough Knowles Otopathology Laboratory, Division of Otopathology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, U.S.A.
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  • Isamu Sando MD, DMSc,

    Corresponding author
    1. Elizabeth McCullough Knowles Otopathology Laboratory, Division of Otopathology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, U.S.A.
    • Isamu Sando, MD, DMSc, Division of Otopathology, Department of Otolaryngology, University of Pittsburgh School of Medicine, Suite 153, Eye and Ear Institute Building, 203 Lothrop Street, Pittsburgh, PA 15213, U.S.A.
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  • Barry E. Hirsch MD,

    1. Division of Otology, Department of Otolaryngology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, U.S.A.
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  • Makoto Miura MD, DMSc,

    1. Elizabeth McCullough Knowles Otopathology Laboratory, Division of Otopathology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, U.S.A.
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  • Seishi Hasebe MD, DMSc,

    1. Elizabeth McCullough Knowles Otopathology Laboratory, Division of Otopathology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, U.S.A.
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  • Carey D. Balaban PhD

    1. Elizabeth McCullough Knowles Otopathology Laboratory, Division of Otopathology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, U.S.A.
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  • Presented at the Fourth Extraordinary International Symposium on Recent Advances in Otitis Media, Sendai, Miyagi, Japan, April 16–20, 2001.

  • Supported by Research Grant R01DC00123-24, National Institute on Deafness and Other Communication Disorders, the National Institutes of Health.

Abstract

Objective To delineate a possible difference in the function of the eustachian tube (ET) between infants and adults.

Study Design Morphometric and histopathological examination on the human temporal bones.

Methods The secretory glands in the ET were studied in serial histological sections through the cartilaginous portion of the human ET obtained from 32 individuals whose ages ranged from 1 day to 19 years. Of these, 26 were normal control cases and 6 were cases with otitis media (OM).

Results In both normal and OM groups, the distribution of the glands was predominantly in the medial side of the cartilaginous portion of the ET, and the volume of the ET glands was directly related to both the volume of the ET lumen and the patients' age. In normal cases, the relative proportion of the three types of acinar cells (mucous, serous, and mixed) varied among the different age groups. The cases in patients under 1 month of age had more mucous glands and fewer serous glands. In cases of the 1-month-old to 7-year-old age group, the three ET gland cell types came to be approximately equal. Relative proportion of the serous glands continuously increased with aging, and in cases of patients older than 7 years of age, serous glands were predominant over the other two components.

Conclusion It is assumed that the greater proportion of mucous glands and insufficient serous glands by 7 years of age reflects immature development, which may be one of the associated factors contributing to recurrent OM among infants.

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