Equine Nasolacrimal Duct Obstruction and Dacryocystitis Study Guide
Overview and Clinical Importance
Nasolacrimal duct (NLD) obstruction and dacryocystitis are frequently encountered conditions in equine ophthalmology. The nasolacrimal system functions to drain tears from the eye to the nasal cavity, and any obstruction leads to epiphora (overflow of tears), ocular discharge, and secondary infection. These conditions may be congenital or acquired and represent an important differential diagnosis for horses presenting with chronic ocular discharge.
Understanding the anatomy of the equine nasolacrimal system is essential for accurate diagnosis and successful treatment. The equine NLD is approximately 24-30 cm long in adult horses, making it one of the longest nasolacrimal ducts among domestic animals and prone to obstruction at multiple sites along its course.
Anatomy of the Equine Nasolacrimal System
The equine nasolacrimal system consists of both secretory and excretory components. The lacrimal gland is located at the dorsolateral aspect of the orbit within the lacrimal fossa, beneath the supraorbital process of the frontal bone.
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