What is the embryology of the lacrimal system relevant to dacryocystitis?

Updated: Oct 08, 2019
  • Author: Grant D Gilliland, MD; Chief Editor: Edsel Ing, MD, MPH, FRCSC  more...
  • Print
Answer

The naso-optic fissure is the source of origin of the lacrimal drainage system. The ectoderm in this region thickens and becomes embedded in the mesenchyme between the lateral nasal and maxillary processes. This cord of ectoderm subsequently canalizes and opens into the conjunctival fornix prior to opening into the nasal vestibule. Frequently, this opening into the nasal cavity is incomplete at birth. Canalization of the lacrimal excretory system begins in the superior portion first and is segmental, only later coalescing to form a continuous lumen. The canaliculi, which develop as outpouchings from the solid cord of ectodermal tissue prior to canalization, also canalize prior to the vertical portions of the nasolacrimal duct.


Did this answer your question?
Additional feedback? (Optional)
Thank you for your feedback!