As a draining and secretory system, the nasolacrimal ducts play a role in tear transport and non-specific immune defense. In this book recent advances about the nasolacrimal ducts have been summarized and discussed in context with nasolacrimal duct pathophysiology. 

and Questions

1.1 Introduction
1.2 Questions
Materials and Methods
2.1 Human Material
2.2 Animal Material
2.3 Light Microscopy
2.4 Lectin Staining
2.5 Immunohistochemistry
2.6 Scanning Electron Microscopy
2.7 Transmission Electron Microscopy
2.8 Corrosion Vascular Casts
2.9 Reverse Transcription Polymerase Chain Reaction and Western Blot
2.10 Animal Investigations/Experiments
Results
3.1 The Epithelium and the Underlying Lamina Propria of the Nasolacrimal Ducts
3.2 The Membranous Part of the Nasolacrimal Ducts
3.3 Absorption Experiments in the Nasolacrimal Ducts
3.4 Pathologic Findings in Dacryostenosis
Discussion
4.1 Mechanisms of Immune Defence in the Nasolacrimal Ducts
4.2 Mechanisms Regulating Tear Flow Through the Nasolacrimal Ducts
4.3 Absorption of Tear Fluid Components
4.4 Insights into the Pathophysiology of Primary Acquired Dacryostenosis
4.5 Considerations on the Relationship Between Dry Eye and the Nasolacrimal Ducts
Outlook.
Summary
References.