Dog Tear Duct Anatomy

In some dogs this nasolacrimal duct can become obstructed or blocked.

Dog tear duct anatomy. Therapy consists of surgically opening the blocked duct and keeping it open by inserting a tube or suture during healing. An incorrectly formed tear duct can also cause tear staining. Blocked tear ducts in dogs have a variety of causes including an eye infection scar tissue swelling or a lack of tear duct development. At the medial canthus there are two entrances into the lacrimal drainage system the upper and lower puncta.

The nasolacrimal duct also called tear duct latin. The lacrimal gland consists of orbital and palpebral parts that are continuous posterolaterally around the concave lateral edge of the aponeurosis of the levator palpebrae superioris muscle. You ll likely notice some epiphora or excess tearing as a sign of this condition along with staining around the eyes. This is an infrequent cause of watering eyes in young dogs.

This overflow of tears can lead to moisture and tear staining below the eye. Previous upper respiratory tract infections. Mesocephalic and dolichocephalic dogs. The facial anatomy of brachycephalic breeds may play a role in this condition.

The precorneal tear film flows over the cornea and conjunctiva into the medial canthal lake. She may instill a dye called fluorescein into the eye to note if it runs out of the nose as well as examining the eye anatomy in detail explains monk. The nasolacrimal tear duct may be flushed to evaluate the external parts of the eye. In dogs b c of infection inflammation is there in the nasolacrimal duct we can clean by passing a small canula in the medial side of eye on both upper and lo.

The lower nasolacrimal duct is most commonly affected and obstruction of the lower duct results in more clinically visible. Obstruction may result in tears overflowing and running out of the eye. Treatment may include flushing of the nasolacrimal duct or. The nasolacrimal duct is about 1 2 to 2 4 cm long it passes through the nasolacrimal canal which is formed by the lacrimal bone and maxilla and.

Clinical signs include dampness beneath the eyes reddish brown staining of the fur beneath the eyes odor skin irritation and skin infection. Epiphora or excessive tearing from the eyes can be a sign of tear duct blockage or more serious eye problems. Drops may be added to the eyes to allow the pupils to become dilated so that the veterinarian may examine the internal parts of the eye using an ophthalmoscope. Ductus nasolacrimalis is a channel that is directly continuous with the lacrimal sac and opens into the nasal cavity forming the final part of the tear drainage system of the lacrimal apparatus.

Glandula lacrimalis is a paired lobular gland located at the upper lateral corner of the orbit that is responsible for the production of tears. Tear stains on dogs are dark brown or reddish marks that appear under the eyes.