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The Human Nasolacrimal Ducts

  • Friedrich¬†Paulsen

Part of the Advances in Anatomy Embryology and Cell Biology book series (ADVSANAT, volume 170)

Table of contents

  1. Front Matter
    Pages N1-XI
  2. Friedrich Paulsen
    Pages 1-5
  3. Friedrich Paulsen
    Pages 7-18
  4. Friedrich Paulsen
    Pages 19-57
  5. Friedrich Paulsen
    Pages 59-85
  6. Friedrich Paulsen
    Pages 87-87
  7. Friedrich Paulsen
    Pages 89-90
  8. Back Matter
    Pages 91-106

About this book

Introduction

The human nasolacrimal ducts are a borderland of both disciplines opthalmology and otorhinolaryngology which work closely together in the tretament of nasolacrimal disorders. The author summarizes recent advances about the nasolacrimal ducts and discusses them in a context with nasolacrimal duct pathophysiology. As a draining and secretory system  the nasolacrimal ducts play a role in tear transport and non-specific immune defense. Moreover, components of tear fluid are absorbed in the nasolacrimal passage and are transported into a surrounding vascular system. This system is comparable to a cavernous body which is subject to vegetative control. Organized mucosa-associated lymphoid tissue (MALT) is present in the nasolacrimal ducts displaying the cytomorphological and immunophenotypic features of MALT. The normally constant  absorption of tear fluid components into the blood vessels of the surrounding cavernous body  that are connected to the blood vessels of the outer eye could be a feedback signal for tear fluid production, which comes to a halt if these tear components are not absorbed. Thus, dry eye could be initiated. Defective stimulation of tear duct-associated lymphoid tissue could result in abnormal immune deviation at the ocular surface leading to an autoimmunological response that causes dry eye pathology. Moreover, malfunctions in the cavernous body and in its innervation may lead to disturbances in the tear outflow cycle, ocular congestions or total occlusion of the lacrimal passage. Based on the findings the pathomechanism of primary acquired dacryostenosis can be explained.  

Keywords

Nasolacrimal Duct electron microscopy eye membrane microscopy pathophysiology physiology transcription

Authors and affiliations

  • Friedrich¬†Paulsen
    • 1
  1. 1.Institute of AnatomyChristian-Albrechts-University of KielKielGermany

Bibliographic information

  • DOI https://doi.org/10.1007/978-3-642-55643-2
  • Copyright Information Springer-Verlag Berlin Heidelberg 2003
  • Publisher Name Springer, Berlin, Heidelberg
  • eBook Packages Springer Book Archive
  • Print ISBN 978-3-540-44076-5
  • Online ISBN 978-3-642-55643-2
  • Series Print ISSN 0301-5556
  • Series Online ISSN 2192-7065
  • Buy this book on publisher's site