duct (dukt) a passage with well-defined walls, especially a tubular structure for the passage of excretions or secretions.duc´tal
mesonephric 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). 
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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.
| mesonephric duct n. See wolffian duct. |
mesonephric duct
[-nef′rik]
Etymology: Gk, mesos + nephros, kidney; L, ducere, to lead
(in embryology) a duct that in the male gives rise to the ducts of the reproductive system (ductus epididymidis, ductus deferens, seminal vesicle, ejaculatory duct). In the female it persists vestigially as Gartner's duct. Also called wolffian duct.
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.
mesonephric
emanating from or pertaining to the mesonephros.
mesonephric duct
embryonal structure that develops into the vas deferens and epididymis in males and remains vestigial in females. Called also wolffian duct. It is subject to a variety of manifestations of segmental aplasia and hypoplasia, especially in bulls. In mares remnants of the ducts may become cystic and produce paraovarian cyst.
mesonephric tube
excretory tube of the mesonephros; becomes the mesonephric duct and contributes in the adult to the vasa efferentia of the male.
mesonephric tubules
embryonic tubules which connect at one end with a blood vessel, at the other with the mesonephric duct.
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