mesonephric duct

Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.
Related to mesonephric duct: urogenital sinus, Mesonephric tubule, mullerian duct


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.

mes·o·neph·ric duct

a duct in the embryo draining the mesonephric tubules in the mesonephros; in the male, it becomes the ductus deferens; in the female, it becomes vestigial.
See also: longitudinal duct of epoophoron.
Farlex Partner Medical Dictionary © Farlex 2012
An embryonal duct that forms from the 25–30th days of gestation in association with the rudimentary pronephros, later becoming the mesonephric excretory duct, the ‘second embryonal kidney’, giving rise to the male reproductive system—rete testis, efferent ducts, epididymis, vas deferens, seminal vesicles. In females, the lack of testosterone results in Wolffian duct regression at the 10–11th week, a portion of which remains as embryonal ‘rests’—Gartner’s duct cysts, epoophoron, Skene's glands, paroophoron
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

mes·o·neph·ric duct

(mez'ō-nef'rik dŭkt)
A duct in the embryo draining the mesonephric tubules; in the male, it becomes the ductus deferens and ureter; in the female, it becomes the ureter's vestigial structures.
Synonym(s): wolffian duct.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


(dukt) [L. ductus, conveyance (for water)]
1. A narrow tubular vessel or channel, esp. one that conveys secretions from a gland.
2. A narrow enclosed channel containing a fluid, e.g., the semicircular duct of the ear.

accessory pancreatic duct

A duct of the pancreas leading into the pancreatic duct or the duodenum near the mouth of the common bile duct. Synonym: duct of Santorini

alimentary duct

An obsolete term for the thoracic duct.

alveolar duct

A branch of a respiratory bronchiole that leads directly to the alveolar sacs of the lungs.
See: alveolus for illus

Bartholin duct

See: Bartholin, Caspar (the younger)
Enlarge picture

bile duct

Any of the intercellular passages that convey bile from the liver to the hepatic duct, which joins the duct from the gallbladder (cystic duct) to form the common bile duct (ductus choledochus), and which enters the duodenum about 3 in (7.6 cm) below the pylorus.
Synonym: biliary duct See: illustration

biliary duct

Bile duct.

Botallo duct

Ductus arteriosus.

cochlear duct

Cochlear spiral canal.

common bile duct

The duct that carries bile and pancreatic juice to the duodenum. It is formed by the union of the cystic duct of the gallbladder and the hepatic duct of the liver and is joined by the main pancreatic duct.
Synonym: ductus choledochus See: biliary tract for illus

cystic duct

The secretory duct of the gallbladder. It unites with the hepatic duct from the liver to form the common bile duct. See: biliary tract for illus

efferent duct

Any of a group of 12 to 14 small tubes that constitute the efferent ducts of the testis. They lie within the epididymis and connect the rete testis with the ductus epididymidis. Their coiled portions constitute the lobuli epididymidis.

ejaculatory duct

The duct that conveys sperm from the vas deferens and secretions from the seminal vesicle to the urethra.

endolymphatic duct

In the embryo, a tubular projection of the otocyst ending in a blind extremity, the endolymphatic sac. In the adult, it connects the endolymphatic sac with the utricle and saccule of the inner ear.

duct of the epoophoron

Gartner's duct.

excretory duct

Any duct that conveys a waste product from an organ, such as the collecting duct of the renal tubule.

Gartner duct

See: Gartner, Hermann

hepatic duct

Either of the ducts that receive bile from the right or left lobe of the liver and carries it to the common bile duct. Synonym: ductus hepaticus dexter; ductus hepaticus sinister

intercalated duct

Any of several short, narrow ducts that lie between the secretory ducts and the terminal alveoli in the parotid and submandibular glands and in the pancreas.

interlobular duct

A duct passing between lobules within a gland, e.g., one of the ducts carrying bile.

lacrimal duct

Any of the small excretory ducts of the lacrimal glands.

lactiferous duct

Any of 15 to 20 ducts that drain the lobes of the mammary gland. Each opens in a slight depression in the tip of the nipple.
Synonym: milk duct
Enlarge picture

lymphatic duct

Either of two main ducts conveying lymph to the bloodstream: the left lymphatic (thoracic) and the right lymphatic duct, which drains lymph from the right side of the body above the diaphragm. It discharges into the right subclavian vein. It is smaller than the left lymphatic duct.
See: thoracic duct; illustration

mesonephric duct

Wolffian duct.

milk duct

Lactiferous duct.

müllerian duct

Either of the bilateral embryonic tubes in the embryo from which the oviducts, uterus, and vagina develop in the female; in the male, they atrophy. Synonym: Müller duct

nasolacrimal duct

A membranous tube that runs in the nasolacrimal canal and drains tears from the lacrimal sac to the nasal cavity. It opens beneath the inferior nasal concha.

omphalomesenteric duct

Yolk stalk.

pancreatic duct

The duct that conveys pancreatic juice to the common bile duct and duodenum. Synonym: duct of Wirsung

papillary duct

Any of the large ducts formed by the uniting of the collecting tubules of the kidney; it empties into the renal pelvis.

papillary duct of Bellini

See: Bellini, Lorenzo

paramesonephric duct

The genital canal in the embryo. In females it develops into the oviducts, uterus, and vagina; in males it degenerates to form the appendix testis.

paraurethral duct

Skene duct.

parotid duct

Stensen duct.

prostatic duct

One of about 20 ducts that discharge prostatic secretion into the urethra. Synonym: duct prostaticus

duct of Rivinus

See: Rivinus, August

salivary duct

Any of the ducts that drain a salivary gland.

duct of Santorini

Accessory pancreatic duct.

secretory duct

Any of the smaller canals of a gland.

segmental duct

One of a pair of embryonic tubes located between the visceral and parietal layers of the mesoblast on each side of the body.

semicircular duct

One of three membranous tubes forming a part of the vestibular labyrinth of the inner ear. They lie within the semicircular canals and bear corresponding names: anterior, posterior, and lateral. The semicircular ducts originate from the utricle as a single common tube (crus communale). The three ducts then branch, and each follows the course of a different bony semicircular canal. At their far ends the ducts widen into an ampulla that contains a specialized endothelium that is sensitive to motion of the endolymph. Axons from receptor cells in these sensory epithelia transmit motion information to the brain via the vestibular division of the vestibulococchlear nerve (CN VIII). See: labyrinth for illus.

seminal duct

Any of the ducts that convey sperm, specifically the ductus deferens and the ejaculatory duct.

Skene duct

See: Skene, Alexander

spermatic duct

The secretory duct of the testicle that later joins the duct of the seminal vesicle to become the ejaculatory duct. Synonym: ductus deferens; vas deferens; testicular duct

Stensen duct

See: Stensen, Niels

striated duct

Any of a class of ducts within the lobules of glands, esp. salivary glands, that contain radially appearing striations within the cells, denoting the presence of mitochondria.

sublingual duct

Any of the secretory ducts of the sublingual gland.
See: Bartholin duct

tear duct

A duct that conveys tears. These include secretory ducts of lacrimal glands, and lacrimal and nasolacrimal ducts.

testicular duct

Spermatic duct.

thoracic duct

The main lymphatic duct, originating at the cisterna chyli. It passes upward through the diaphragm into the thorax and continues upward along the aorta and esophagus to the neck, where it turns to the left and enters the left subclavian vein near its junction with the left internal jugular vein. It receives lymph from all parts of the body except the right side of the head, neck, thorax, and upper extremity. See: lymphatic system for illus

thyroglossal duct

In the embryo, a duct that connects the thyroid diverticulum with the tongue. It eventually disappears, its point of origin being indicated as a pit, the foramen cecum. It sometimes persists as an anomaly.

umbilical duct

Yolk stalk.

utriculosaccular duct

A narrow tube emanating from the utricle, connecting it to the saccule, and opening into the endolymphatic duct of the inner ear.

vitelline duct

Yolk stalk.

wolffian duct

In the embryo, the duct leading from the mesonephros to the cloaca. From it develop the ductus epididymis, ductus deferens, seminal vesicle, ejaculatory duct, ureter, and pelvis of the kidney.
Synonym: mesonephric duct
Medical Dictionary, © 2009 Farlex and Partners


Kaspar F., German embryologist in Russia, 1733-1794.
wolffian body - one of three excretory organs appearing in the evolution of vertebrates. Synonym(s): canal of Oken; corpus of Oken; mesonephros
wolffian cyst - a cyst lying in the broad ligaments of the uterus and arising from any mesonephric structures.
wolffian duct - a duct in the embryo draining the mesonephric tubules. Synonym(s): mesonephric duct
wolffian rest - remnants of the wolffian duct in the female genital tract that give rise to cysts. Synonym(s): mesonephric rest
wolffian ridge - one of the paired longitudinal ridges developing in the dorsal body wall of the embryo. Synonym(s): urogenital ridge
wolffian tubules - Synonym(s): Kobelt tubules
Medical Eponyms © Farlex 2012
References in periodicals archive ?
Sadler [21] about the fate of mesonephros noted that in males, until the end of the second month (60 days) tubules and glomeruli of mesonephros kidney atrophied and some terminal mesonephric ducts remain which are involved in the epididymis, vas deferens channels etc.
The seminiferous tubules converge to form the rete testis, which connects to the mesonephric duct via the mesonephric tubules, which later become the efferent ducts.
Unilateral absence of the scrotal vas deferens associated with contralateral mesonephric duct anomalies resulting in infertility: Laboratory, physical and radiographic findings, and therapeutic alternatives.
This form is the rarest and may result from simultaneous duplication of the genital ridge and mesonephric duct (Figure 2).
In fetal life, at about 6 weeks of gestation, the primordial testis develops from the primitive genital ridge medial to the mesonephric ducts. The primordial testis takes shape and the epididymis with the vas deferens arise from the mesonephric duct at 8 weeks.[sup.4] On the basis of embryologic development, Leung classified polyorchidism into 4 types.[sup.5] In type A, the division separates a small part of the genital ridge which does not contact the mesonephric duct.
The close relationship between the mullerian ducts, which fuse to form the uterus, and the mesonephros during embryologic life supports this proposed origin.[4] Remnants of implanted mesonephric duct tissue, derived during mullerian duct fusion, may account for the origin of uterine or cervical EWT.
PATHOLOGY: PUV results from the formation of a thick, valve-like membrane from tissue of Wolffian duct origin (Failure of regression of the mesonephric duct) that courses obliquely from the verumontanum to the most distal portion of the prostatic urethra.
As a result of the interaction between the ureteral bud and the mesonephric duct during embryogenesis, many associated anomalies were observed.
INTRODUCTION: Ectopic ureteric orifice is a rare congenital anomalous defect of urinary tract resulting from abnormal embryological development, where ureteral orifice is abnormally located and instead of draining in bladder, it drains in to urethra, vagina or in structures of mesonephric duct (ductus deference and seminal vesicles).
Initially three parts can be recognized in each duct (a) a cranial vertical portion that opens into the abdominal cavity (b) a horizontal part that crosses the mesonephric duct (c) a caudal vertical part that fuses with its partner from the opposite side with the decent of the ovary.
Differential diagnoses include lymphangioma, mesenteric/omental cysts, cystic teratoma, pseudo myxoma peritonei, cystic smooth muscle tumours, visceral cysts, endometriosis, cystic mesonephric duct remnants, cystic mucinous neoplasms of pancreas, non pancreatic pseudocysts.
Cystic dilatation of seminal vesicle may also occurs along with ectopic ureteral insertion into seminal vesicle, presumably due to ureteral budding occurring from the portion of the mesonephric duct destined to be the seminal vesicle (5).