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The nasolacrimal duct functions by draining old tears from the eye into the nose. From there, the tears are reabsorbed, are wiped away with a tissue or drain into the throat to be swallowed. Tears drained through the tear ducts include more than the ones that appear when we cry.
The tear duct is part of the tear drainage system. It drains tears through the nasal bone and into the back of the nose. The tear duct is also called the nasolacrimal duct. Learn more about tears and crying.
The nasolacrimal duct (also called the tear duct) carries tears from the lacrimal sac of the eye into the nasal cavity. [1] [2] The duct begins in the eye socket between the maxillary and lacrimal bones, from where it passes downwards and backwards.
Your tear system (lacrimal apparatus) is a network of glands, sacs and ducts around your eyes. It makes new tears and drains old ones out of your eyes. Dry or watery eyes are the most common symptom of something interfering with your tear system.
Tear glands and tear ducts. The tear glands located above each eyeball, called the lacrimal glands, continuously supply tear fluid that's wiped across the surface of your eye each time you blink your eyelids. Excess fluid drains through the tear ducts into the nose.
The nasolacrimal duct (also known as the tear duct) carries tears or lacrimal fluid from the lacrimal sac of the eye into the inferior nasal meatus. The lacrimal gland produces lacrimal fluid when stimulated by parasympathetic impulses from the facial nerve (CN VII) .
Tears wet both the front of the eye, and the inner surface of the upper eyelid. The relatively thin tear layer on the surface of the eye is covered by an oily layer that prevents tears from evaporating. This oily layer of lipids is largely composed of nonpolar lipids secreted by tarsal glands.
The nasolacrimal duct (NLD) is the terminal part of the nasolacrimal apparatus. Gross anatomy. The nasolacrimal duct is the inferior continuation of the lacrimal sac and is ~17 mm in length in total. The duct runs in the bony nasolacrimal canal. There are two parts to the nasolacrimal duct:
Tear Duct Anatomy. When the eye blinks, the lid pushes the tears across the eye into the drains (puncta) at the inner corner. The drains empty into channels (canaliculi) that connect the eye with the nose. The channels drain into a tear sac (lacrimal sac) that lies beside the nose.
Health Library Search. Tear Duct Anatomy. When the eye blinks, the lid pushes the tears across the eye into the drains (puncta) at the inner corner. The drains empty into channels (canaliculi) that connect the eye with the nose. The channels drain into a tear sac (lacrimal sac) that lies beside the nose.