duct (dukt) a passage with well-defined walls, especially a tubular structure for the passage of excretions or secretions.duc´tal
Lacrimal duct
lacrimal duct,
aberrant duct any duct that is not usually present or that takes an unusual course or direction.
alveolar ducts small passages connecting the respiratory bronchioles and alveolar sacs.
Bartholin's duct the larger of the sublingual ducts, which opens into the submandibular duct.
Bellini's duct papillary d.
bile duct
1. any of the passages that convey bile in and from the liver.
biliary duct bile d.
branchial ducts the drawn-out branchial grooves which open into the temporary cervical sinus of the embryo.
cochlear duct a spiral tube in the bony canal of the cochlea, divided into the scala tympani and scala vestibuli by the lamina spiralis.
common bile duct the duct formed by the union of the cystic and hepatic ducts.
ducts of Cuvier two short venous trunks in the fetus opening into the atrium of the heart; the right one becomes the superior vena cava.
cystic duct the passage connecting the gallbladder neck and the common bile duct.
deferent duct ductus deferens.
efferent duct any duct which gives outlet to a glandular secretion.
ejaculatory duct the duct formed by union of the ductus deferens and the duct of the seminal vesicle, opening into the prostatic urethra on the colliculus seminalis.
endolymphatic duct a canal connecting the membranous labyrinth of the ear with the endolymphatic sac.
duct of epididymis the single tube into which the coiled ends of the efferent ductules of the testis open; its convolutions make up most of the epididymis.
excretory duct one that is merely conductive and not secretory.
genital duct see under canal.
hepatic duct the excretory duct of the liver (common hepatic d.), or one of its branches in the lobes of the liver (left and right hepatic d's). 
)
interlobular ducts channels between different lobules of a gland.
lacrimal duct see under canaliculus.
lactiferous ducts ducts conveying the milk secreted by the mammary lobes to and through the nipples.
Luschka's ducts tubular structures in the wall of the gallbladder; some are connected with bile ducts, but none with the lumen of the gallbladder.
lymphatic ducts channels for conducting lymph.
lymphatic duct, left thoracic d.
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.
mesonephric duct an embryonic duct of the mesonephros, which in the male develops into the epididymis, ductus deferens and its ampulla, seminal vesicles, and ejaculatory duct and in the female is largely obliterated.
duct of Müller , müllerian duct paramesonephric d.
nasolacrimal duct the canal conveying the tears from the lacrimal sac to the inferior meatus of the nose.
omphalomesenteric duct yolk stalk.
pancreatic duct the main excretory duct of the pancreas, which usually unites with the common bile duct before entering the duodenum.
papillary duct a wide terminal tubule in the renal pyramid, formed by union of several straight collecting tubules and emptying into the renal pelvis.
paramesonephric duct either of the paired embryonic ducts developing into the uterine tubes, uterus, and vagina in the female and becoming largely obliterated in the male.
paraurethral ducts of female urethra inconstantly present ducts in the female, which drain a group of the urethral glands into the vestibule.
paraurethral ducts of male urethra the ducts of the urethral glands situated in the spongy portion of the male urethra.
parotid duct the duct by which the parotid gland empties into the mouth.
perilymphatic duct cochlear aqueduct.
pronephric duct the duct of the pronephros, which later serves as the mesonephric duct.
ducts of prostate gland , prostatic ducts see under ductule.
ducts of Rivinus the small sublingual ducts which open into the mouth on the sublingual fold.
duct of Santorini a small inconstant duct draining a part of the head of the pancreas into the minor duodenal papilla.
secretory duct a smaller duct that is tributary to an excretory duct of a gland and that also has a secretory function.
semicircular ducts the long ducts of the membranous labyrinth of the ear.
seminal ducts the passages for conveyance of spermatozoa and semen.
spermatic duct ductus deferens.
duct of Steno , Stensen's duct parotid d.
submandibular duct , submaxillary duct of Wharton the duct that drains the submandibular gland and opens at the sublingual caruncle.
tear ducts the ducts conveying the secretion of the lacrimal glands.
thoracic duct the canal that ascends from the cisterna chyli to the junction of the left subclavian and left internal jugular veins.
thyroglossal duct , thyrolingual duct an embryonic duct extending between the thyroid primordium and the posterior tongue.
urogenital ducts the paramesonephric and mesonephric ducts.
Wharton's duct submandibular d.
duct of Wirsung pancreatic d.
wolffian duct mesonephric d.
| lacrimal duct n. A curved canal beginning at the margin of each eyelid near the medial commissure, and emptying with the duct from the other eye into the lacrimal sac. Also called lacrimal canal. |
Lacrimal duct
A short canal leading from a small orifice at the medial angle of each eyelid to the lacrimal sac.
Mentioned in: Lacrimal Duct Obstruction
lacrimal duct,
one of a pair of channels through which tears pass from the lacrimal lake to the lacrimal sac of each eye. Also called lacrimal canaliculus.
duct
a passage with well-defined walls, especially a tubular structure for the passage of excretions or secretions. See also ductus.
accessory pancreatic duct
the duct of the dorsal pancreatic primordium that opens on the minor duodenal papilla. Called also Santorini's duct or duct of Santorini.
allantoic duct
see urachus.
alveolar duct
one of the final branches of the bronchial tree consisting of a tube whose walls are composed of alveoli.
bile duct, biliary duct
the passages for the conveyance of bile in and from the liver. See also bile duct.
cochlear duct
a spiral membranous tube in the bony canal of the cochlea divided into the scala tympani, scala vestibuli and spiral lamina.
common bile duct
a duct formed by the union of the cystic and hepatic ducts. See also bile duct.
cystic duct
the passage connecting the gallbladder neck and the 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. Found in the horse and ruminants.
endolymphatic duct
a canal connecting the membranous labyrinth of the ear with the endolymphatic sac.
epididymal duct
developed from the first part of the mesonephric duct.
excretory duct
one through which the secretion is conveyed from a gland.
duct of Gartner
see gartner's ducts.
hepatic duct
the excretory duct of the liver, or one of its branches in the lobes of the liver. See also bile duct.
incisive duct
one of a pair of ducts perforating the palate and which communicate between the mouth and the nasal cavity; they are thought to conduct chemicals for olfactory appraisal by the vomeronasal organ.
intralobar duct
ducts within lobes which provide drainage for secretions of lobes of glands.
intralobular duct
ducts found within lobules which provide drainage for secretions of lobules of glands.
lacrimal duct
one of the excretory ducts of the lacrimal gland. See also lacrimal apparatus.
lacrimonasal duct
nasolacrimal duct.
lactiferous duct
ducts conveying the milk secreted by the lobes of the mammary gland to the lactiferous sinuses or to the teats.
lobar duct
drains the secretions from the lobes of gland, connecting with the main excretory duct.
lobular duct
drains the secretions of lobules of glands.
lymphatic duct
larger lymph drainage vessels, e.g. thoracic duct.
lymphatic duct (left)
thoracic duct.
lymphatic duct (right)
a vessel draining lymph from the cranial 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.
mammary duct
lactiferous ducts.
mandibular duct
drainage duct of the mandibular salivary gland.
mesonephric duct
see mesonephric duct.
metanephric duct
the embryonic ureter.
müllerian duct
see müllerian duct.
nasal duct
the duct leading from the lacrimal sac, opening on the floor of the nasal vestibule. Called also nasolacrimal duct. See also lacrimal apparatus.
nasolacrimal duct
see nasal duct (above).
nasopalatine duct
see incisive duct (above).
pancreatic duct
the main excretory duct of the pancreas, which usually opens with the bile duct on the major duodenal papilla; may be a single duct, or two ducts which join, or two independent ducts opening into opposite sides of the intestine. See also bile duct. Called also Wirsung's duct.
papillary d's (kidney)
the straight excretory or collecting portions of the renal tubules, which descend through the renal medulla to a renal papilla or renal crest.
papillary duct (teat)
see teat canal.
paramesonephric duct
parotid duct
the duct by which the parotid gland empties into the mouth vestibule opposite the upper molars. See also parotid glands.
perilymphatic duct
see aqueduct of cochlea.
pronephric duct
the early embryonic duct from the primitive kidney which leads into the mesonephric duct in the embryo's later stages.
prostatic d's
minute ducts from the prostate, opening into or near the prostatic sinuses on the dorsal wall of the urethra.
salivary d's
the ducts of the salivary glands.
semicircular d's
the long ducts of the membranous labyrinth of the ear.
sublingual duct
the excretory ducts of the sublingual salivary glands.
submandibular duct
the duct that drains the submandibular gland and opens at the sublingual caruncle. Called also submaxillary duct.
submaxillary duct
submandibular duct (above).
tear duct
nasolacrimal 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 jugular veins. It acts as a channel for the collection of lymph from the portions of the body caudal to the diaphragm and from the left side of the body cranial to the diaphragm.
thyroglossal duct
the transient, non-patent duct, from the thyroid gland to the floor of the pharynx which is the legacy of the development of the thyroid from the floor of the pharynx.
vitelline duct
see meckel's diverticulum.
lacrimal
pertaining to tears.
lacrimal apparatus
a group of organs concerned with the production and drainage of tears; it is a nutritive and protective device that helps keep the eye moist and free of dust and other irritating particles. Includes lacrimal gland, accessory lacrimal glands, third eyelid glands and the nasolacrimal duct.
)
Nasolacrimal apparatus in the dog.By permission from McCurnin D, Poffenbarger EM, Small Animal Physical Diagnosis and Clinical Procedures, Saunders, 1991
lacrimal canaliculus
the lacrimal duct within the eyelid.
lacrimal caruncle
the rounded, often pigmented swelling at the medial canthus of the eye.
lacrimal cyst
congenital displacement of lacrimal tissue results in subconjunctival cysts.
lacrimal drainage system
the structures concerned with tear collection; includes lacrimal lake, puncta, canaliculi, sac and nasolacrimal duct.
lacrimal duct
there are two of these minute ducts draining tears from the conjunctiva, via the lacrimal puncta, into the lacrimal sac. Called also lacrimal canaliculus.
lacrimal duct irrigator
a 20 gauge, blunt-pointed, straight or curved cannula with a needle attachment so that it can be attached directly to a syringe nozzle.
lacrimal fossa
fossa in the medial wall of the orbital rim which houses the lacrimal sac.
lacrimal gland
contained in a pad of fat in the dorsolateral part of the orbital cavity and drains into the conjunctival sac via many excretory ducts. The secretion is largely watery tears, but in the pig is mucus. May develop adenitis.
lacrimal gland anomalies
failure of patency of the duct, supernumerary opening of the duct and ductal ectasia recorded.
lacrimal gland atrophy
part of the syndrome of keratoconjunctivitis sicca.
imperforate lacrimal puncta
see imperforate punctum.
lacrimal lake
the recess between the lids at the nasal commissure of the eye where the tears collect.
lacrimal pump
contraction of the orbiculari oculi muscle creates pressure on the lacrimal sac which causes tears to drain from the lacrimal lake.
lacrimal punctum
there is one on each eyelid close to the medial canthus. Each drains tears from the conjunctival sac into the lacrimal duct in the same eyelid. The tears then pass to the lacrimal sac and into the nasolacrimal duct. See also punctum.
lacrimal reflex
tear production caused by irritation of the cornea and conjunctiva.
lacrimal sac
the distended proximal end of the nasolacrimal duct into which the lacrimal ducts empty.
lacrimal sinus
an excavation of the lacrimal bone which communicates with the maxillary sinus in some species.
lacrimal system
see lacrimal apparatus (above).
tear duct
One of about a dozen ducts of the lacrimal gland. It originates in the orbital part of the gland, traverses the palpebral part of the gland and opens into the lateral superior fornix of the conjunctival sac. Syn. lacrimal duct. See lacrimal apparatus.
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