nasolacrimal duct


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Related to nasolacrimal duct: nasolacrimal duct obstruction

duct

 [dukt]
a passage with well-defined walls, especially a tubular structure for the passage of excretions or secretions. adj., adj ductal.
accessory duct of Santorini a tubular structure that drains the lower part of the head of the pancreas.
alveolar d's small passages connecting the respiratory bronchioles and the alveolar sacs.
Bartholin's duct (duct of Bartholin) the larger and longer of the sublingual ducts.
bile d's (biliary d's) see bile ducts.
cochlear duct a spiral membranous tube in the bony canal of the cochlea between Reissner's membrane and the basilar membrane; it is divided into the scala tympani, scala vestibuli, and spiral lamina. Called also scala media.
common bile duct a duct formed by the union of the cystic and hepatic ducts; see also bile ducts.
cystic duct the passage connecting the gallbladder neck and the common bile duct.
efferent duct any duct that gives outlet to a glandular secretion.
ejaculatory duct the duct formed by union of the ductus deferens and the duct of the seminal vesicles, opening into the prostatic urethra on the colliculus seminalis.
endolymphatic duct a canal connecting the membranous labyrinth of the ear with the endolymphatic sac.
excretory duct one through which the secretion is conveyed from a gland.
hepatic duct the excretory duct of the liver, or one of its branches in the lobes of the liver; see also bile ducts.
Hepatic duct. From Applegate, 2000.
lacrimal duct the excretory duct of the lacrimal gland; see also lacrimal apparatus. Called also lacrimal canaliculus.
lacrimonasal duct nasal duct.
lactiferous d's ducts conveying the milk secreted by the lobes of the breast to and through the nipples.
lymphatic duct, left thoracic duct.
lymphatic d's see lymphatic ducts.
mammary duct lactiferous ducts.
mesonephric duct an embryonic duct of the mesonephros, which in the male becomes the epididymis, ductus deferens and its ampulla, seminal vesicles, and ejaculatory duct, and in the female is largely obliterated.
müllerian duct either of the two paired embryonic ducts developing into the vagina, uterus, and fallopian tubes, and becoming largely obliterated in the male.
nasal duct (nasolacrimal duct) the downward continuation of the lacrimal sac, opening on the lateral wall of the inferior meatus of the nose; see also lacrimal apparatus.
pancreatic duct the main excretory duct of the pancreas, which usually unites with the common bile duct before entering the duodenum at the major duodenal papilla; see also bile ducts.
papillary d's straight excretory or collecting portions of the renal tubules, which descend through the renal medulla to a renal papilla.
paramesonephric duct müllerian duct.
paraurethral d's Skene's glands.
parotid duct the duct by which the parotid glands empty into the mouth.
prostatic d's minute ducts from the prostate, opening into or near the prostatic sinuses on the posterior wall of the urethra.
lymphatic duct, right a vessel draining lymph from the upper right side of the body, receiving lymph from the right subclavian, jugular, and mediastinal trunks when those vessels do not open independently into the right brachiocephalic vein.
salivary d's the ducts of the salivary glands.
semicircular d's the long ducts of the membranous labyrinth of the ear.
seminal d's the passages for conveyance of spermatozoa and semen.
sublingual d's the excretory ducts of the sublingual salivary glands.
submandibular duct (submaxillary duct) the duct that drains the submandibular gland and opens at the sublingual caruncle.
tear duct lacrimal duct.
thoracic duct a duct beginning in the cisterna chyli and emptying into the venous system at the junction of the left subclavian and left internal jugular veins. It acts as a channel for the collection of lymph from the portions of the body below the diaphragm and from the left side of the body above the diaphragm.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

na·so·lac·ri·mal duct

[TA]
the passage leading downward from the lacrimal sac on each side to the anterior portion of the inferior meatus of the nose, through which tears are conducted into the nasal cavity.
Farlex Partner Medical Dictionary © Farlex 2012

na·so·lac·ri·mal duct

(nā'zō-lak'ri-măl dŭkt) [TA]
The passage leading downward from the lacrimal sac on each side to the anterior portion of the inferior meatus of the nose, through which tears are conducted into the nasal cavity.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

nasolacrimal duct

The membranous passage that carries the overflow of tears from the LACRIMAL SAC to the interior of the nose, opening just under the lower TURBINATE. Blockage of the nasolacrimal duct causes a persistently watering eye.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

Nasolacrimal duct

A channel that transmits tears from the lacrimal sac to the nose.
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.

lacrimal apparatus

The system involved in the production and conduction of tears. It consists of the lacrimal gland and accessory lacrimal glands (glands of Krause and Wolfring); the eyelid margins; and the two puncta lacrimae. Each punctum is a small round or oval aperture situated on a slight elevation at the inner end of the upper and lower lid margin (lacrimal papilla) and forms the entrance to the canaliculi. Each canaliculus consists of a vertical portion of about

lacrimal apparatus

The system involved in the production and conduction of tears. It consists of the lacrimal gland and accessory lacrimal glands (glands of Krause and Wolfring); the eyelid margins; and the two puncta lacrimae. Each punctum is a small round or oval aperture situated on a slight elevation at the inner end of the upper and lower lid margin (lacrimal papilla) and forms the entrance to the canaliculi. Each canaliculus consists of a vertical portion of about 2 mm long and then bends inward for some 8 mm, the upper one being slightly shorter. The canaliculi pierce the lacrimal fascia (i.e. the periorbita covering the lacrimal sac or tear sac) and unite (forming the common canaliculus) to enter a small diverticulum of the sac called the sinus of Maier. The lacrimal sac is closed above and open below where it is continuous with the nasolacrimal duct which extends over some 1.5 cm in length to Hasner's valve (or Bianchi's valve or plica lacrimalis) (folds of mucous membrane) at the inferior meatus of the nose. The inferior opening of the duct is called the ostium lacrimale (Fig. L1). See dacryocystitis; epiphora; lacrimal fistula; fossa for the lacrimal sac; Sjögren's syndrome; tear duct; dye dilution test; Jones II test; valve of Krause.
Fig. L1 Lacrimal apparatusenlarge picture
Fig. L1 Lacrimal apparatus
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann

na·so·lac·ri·mal duct

(nā'zō-lak'ri-măl dŭkt) [TA]
The passage leading downward from the lacrimal sac on each side to the anterior portion of the inferior meatus of the nose, through which tears are conducted into the nasal cavity.
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
Nasolacrimal duct obstruction in children: outcome of intubation.
The patient was treated with a complete surgical resection of the lacrimal sac and nasolacrimal duct. The medial and lateral walls of the maxillary sinus were removed via a lateral rhinotomy.
After this, lacrimal syringing was done from both upper and lower puncta with betadine to clear purulent secretions and also patency of nasolacrimal duct was confirmed through nasal endoscopy with free flow of fluid.
Lueder, "The association of neonatal dacryocystoceles and infantile dacryocystitis with nasolacrimal duct cysts (an American ophthalmological society thesis)," Transactions of the American Ophthalmological Society, vol.
Discussion: In the first year of life, probing is an effective treatment for congenital nasolacrimal duct obstruction in cases not improving with conservative Treatment.
Trauma: Fracture of the ascending process of maxilla or lacrimal bone following road traffic accident or surgery may sever or compress the nasolacrimal duct, or sac may lead to stenosis or atresia.
Negotiate it to come out from newly created inside the nose to break any adhesion at opening of nasolacrimal duct near the sac.
Our study in Mexican population reports values that tend to be smaller than those of other populations, so we believe that there are differences in the NLD between ethnic groups (Table III), which could explain differences between countries in prevalence of lower nasolacrimal duct obstruction in adults.
Seiff, "Silicone intubation for the treatment of epiphora in adults with presumed functional nasolacrimal duct obstruction," Ophthalmic Plastic and Reconstructive Surgery, vol.
art.) Lateral lamella 86.4 10.0 3.6 0.0 olfactory fossa Cribriform plate 94.4 27.0 21.8 1.8 Posterior ethmoidal 67.9 15.8 10.0 6.4 artery canal Optical nerve 93.3 4.3 2.4 0.0 Vidian nerve 94.2 2.1 3.0 0.6 Maxillary nerve 95.4 2.4 2.1 0.0 Carotid artery 83.0 12.8 3.5 0.6 Nasolacrimal duct 98.5 1.5 0.0 0.0 Frontal sinus 98.2 1.2 0.6 0.0 Low dosage (N = 165) Excellent Well Poor Not p value evaluable Maxillary sinus 80.7 15.3 4.0 0.0 0.791 (lateral wall) Uncinate process 67.4 11.1 14.8 6.7 0.022 * Inferior turbinate 87.0 7.3 4.3 1.3 0.917 (os turbinale) Infraorbital nerve 59.3 29.3 11.3 0.0 0.682 canal Lamina papyracea 93.7 5.0 1.3 0.0 0.119 (infundibulum) Anterior ethmoidal 91.7 7.7 0.7 0.0 0.107 artery canal Lamina papyracea 97.0 2.3 0.7 0.0 0.248 (ant.
He was seen by an ophthalmologist a month earlier who found left nasolacrimal duct obstruction on exam.
Some authors suggest that these lesions originate from displaced epithelium of the nasolacrimal duct remnants, while others suggest that it is a developmental fissural cyst originating from epithelial remnants entrapped between the lateral nasal, globular, and maxillary processes [1].