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A tubular structure giving exit to the secretion of a gland, or conducting any fluid. See also canal.ductus [NA]; [L. duco, pp. ductus, to lead]
aberrant d.'s aberrant ductules, under ductule
aberrant bile d.'s small d.'s occasionally present in the ligaments of the liver or originating from the surface of the liver.
accessory pancreatic d. the excretory duct of the head of the pancreas, one branch of which joins the pancreatic duct, the other opening independently into the duodenum at the lesser duodenal papilla.ductus pancreaticus accessorius [NA] , Bernard's canal, Bernard's d., ductus dorsopancreaticus, Santorini's canal, Santorini's d;
alveolar d. 1. the part of the respiratory passages distal to the respiratory bronchiole; from it arise alveolar sacs and alveoli; 2. the smallest of the intralobular d.'s in the mammary gland, into which the secretory alveoli open.ductulus alveolaris [NA];
amniotic d. the transitory opening between the seroamniotic folds in birds just before they fuse to form the seroamniotic raphe.
anal d.'s short d.'s lined with simple columnar to stratified columnar epithelium that extend from the valvulae anales to the sinus anales.
arterial d. ductus arteriosus
Bartholin's d. major sublingual d
Bellini's d.'s papillary d.'s
Bernard's d. accessory pancreatic d
bile d. any of the d.'s conveying bile between the liver and the intestine, including hepatic, cystic, and common bile d.biliary d;
biliary d. bile d
Blasius' d. parotid d
Botallo's d. ductus arteriosus
bucconeural d. craniopharyngeal d
d. of bulbourethral gland the long slender duct on each side passing down through the inferior fascia of the urogenital diaphragm to enter the bulb of the penis and course forward 2 or 3 cm before terminating in the urethra.ductus glandulae bulbourethralis [NA];
canalicular d.'s 1. lactiferous d.'s 2. biliary ductules, under ductule
carotid d. ductus caroticus
cervical d. See cervical diverticulum.
choledoch d. common bile d
cochlear d. a spirally arranged membranous tube suspended within the cochlea, occupying the lower portion of the scala vestibuli; it begins by a blind extremity, the vestibular cecum, in the cochlear recess of the vestibule, terminating in another blind extremity, the cecum cupulare or lagena, at the cupola of the cochlea; it contains endolymph and communicates with the sacculus by the ductus reuniens; the spiral organ (of Corti), the neuroepithelial receptor organ for hearing, occupies the floor of the duct.ductus cochlearis [NA] , Löwenberg's canal, Löwenberg's scala, membranous cochlea, scala media;
common bile d. a duct formed by the union of the hepatic and cystic ducts; it discharges at the duodenal papilla.ductus choledochus [NA] , choledoch d., choledoch, choledochus;
common hepatic d. the part of the biliary duct system that is formed by the confluence of right and left hepatic ducts. At the porta hepatis it is joined by the cystic duct to become the common bile duct.ductus hepaticus communis [NA] , hepatocystic d;
craniopharyngeal d. the slender tubular part of the hypophysial diverticulum; the stalk of Rathke's pocket.bucconeural d., hypophysial d;
Cuvier's d.'s obsolete term for the common cardinal veins.
cystic d. , cystic gall d. the d. leading from the gallbladder; it joins the hepatic duct to form the common bile duct.ductus cysticus [NA];
deferent d. ductus deferens
efferent d. efferent ductules of testis, under ductule
ejaculatory d. the duct formed by the union of the deferent duct and the excretory duct of the seminal vesicle, which opens into the prostatic urethra.ductus ejaculatorius [NA] , spermiduct (2);
endolymphatic d. a small membranous canal, connecting with both saccule and utricle of the membranous labyrinth, passing through the aqueduct of vestibule, and terminating in a dilated blind extremity, the endolymphatic sac, on the posterior surface of the petrous portion of the temporal bone beneath the dura mater.ductus endolymphaticus [NA];
d. of epididymis a convoluted tube into which the efferent ductules open and which itself terminates in the ductus deferens.ductus epididymidis [NA];
excretory d. a d. carrying the secretion from a gland or a fluid from any reservoir.ductus excretorius;
excretory d.'s of lacrimal gland the multiple (6 to 10) excretory ducts of the lacrimal gland that open into the superior fornix of the conjunctival sac.ductuli excretorii glandulae lacrimalis [NA] , excretory ductules of lacrimal gland;
excretory d. of seminal vesicle the passage leading from a seminal vesicle to the ejaculatory duct.ductus excretorius vesiculae seminalis [NA];
frontonasal d. the passage that leads downward from the frontal sinus to open into the ethmoidal infundibulum.
galactophorous d.'s lactiferous d.'s
gall d. Obsolete term for bile d.
Gartner's d. longitudinal d. of epoöphoron
genital d. genital tract
guttural d. auditory tube
hemithoracic d. an accessory thoracic duct, usually emptying into the thoracic duct but sometimes discharging independently into the right subclavian vein.ductus hemithoracicus;
Hensen's d. uniting d
hepatic d. See common hepatic d., right hepatic d., left hepatic d.
hepatocystic d. common hepatic d
Hoffmann's d. pancreatic d
hypophysial d. craniopharyngeal d
incisive d. a rudimentary duct, or protrusion of the mucous membrane into the incisive canal, on either side of the anterior extremity of the nasal crest.ductus incisivus [NA];
intercalated d.'s the minute d.'s of glands, such as the salivary and the pancreas, that lead from the acini; they are lined by low cuboidal cells.
interlobar d. a d. draining the secretion of the lobe of a gland and formed by the junction of a number of interlobular d.'s.
interlobular d. any d. leading from a lobule of a gland and formed by the junction of the fine d.'s draining the acini.
intralobular d. a d. that lies within a lobule of a gland.
jugular d. jugular lymphatic trunk
lactiferous d.'s the ducts, numbering 15 or 20, which drain the lobes of the mammary gland; they open at the nipple.ductus lactiferi [NA] , canalicular d.'s (1) , galactophore, galactophorous canals, galactophorous d.'s, mamillary d.'s, mammary d.'s, milk d.'s, tubuli galactophori, tubuli lactiferi;
left d. of caudate lobe a tributary to the left hepatic duct draining bile from the left half of the caudate lobe.ductus lobi caudati sinister [NA];
left hepatic d. the duct that drains bile from the left half of the liver, including the quadrate lobe and the left part of the caudate lobe.ductus hepaticus sinister [NA];
longitudinal d. of epoöphoron a rudimentary vestige of the mesonephric duct in the female into which the tubules of the epoöphoron open; it is located in the broad ligament of the uterus, parallel with the lateral part of the uterine tube, and in the lateral walls of the cervix and vagina.ductus epoöphori longitudinalis [NA] , ductus deferens vestigialis, Gartner's canal, Gartner's d;
Luschka's d.'s glandlike tubular structures in the wall of the gallbladder, especially in the part covered with peritoneum.
lymphatic d. one of the two large lymph channels, right lymphatic d. or thoracic d.
major sublingual d. the duct that drains the anterior portion of the sublingual gland; it opens at the sublingual papilla.ductus sublingualis major [NA] , Bartholin's d;
mamillary d.'s lactiferous d.'s
mammary d.'s lactiferous d.'s
mesonephric d. a duct in the embryo draining the mesonephric tubules; in the male it becomes the ductus deferens; in the female it becomes vestigial. See also longitudinal d. of epoöphoron.ductus mesonephricus [NA] , wolffian d;
metanephric d. the slender tubular portion of the metanephric diverticulum; the primordium of the epithelial lining of the ureter. See epoöphoron, longitudinal d. of epoöphoron.
milk d.'s lactiferous d.'s
minor sublingual d.'s from 8 to 20 small ducts of the sublingual salivary gland that open into the mouth on the surface of the sublingual fold; a few join the submandibular ducts.ductus sublinguales minores [NA] , Rivinus' d.'s, Walther's canals, Walther's d.'s;
Müller's d. , müllerian d. paramesonephric d
nasal d. nasolacrimal d
nasolacrimal d. 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.ductus nasolacrimalis [NA] , nasal d;
nephric d. pronephric d
omphalomesenteric d. obsolete term for yolk stalk.
pancreatic d. the excretory duct of the pancreas that extends through the gland from tail to head where it empties into the duodenum at the greater duodenal papilla.ductus pancreaticus [NA] , Hoffmann's d., Wirsung's canal, Wirsung's d;
papillary d.'s the largest straight excretory d.'s in the kidney medulla and papillae whose openings form the area cribrosa; they are a continuation of the collecting tubules.Bellini's d.'s;
paramesonephric d. either of the two paired embryonic tubes extending along the mesonephros roughly parallel to the mesonephric duct and emptying into the cloaca; in the female, the upper parts of the ducts form the uterine tubes, while the lower fuse to form the uterus and part of the vagina; in the male, vestiges of the ducts form the vagina masculina and the appendix testis.ductus paramesonephricus [NA] , Müller's d., müllerian d;
paraurethral d.'s inconstant ducts along the side of the female urethra that convey the mucoid secretion of Skene's glands to the vestibule.ductus paraurethrales [NA] , d.'s of Skene's glands, Schüller's d.'s;
parotid d. the duct of the parotid gland opening from the cheek into the vestibule of the mouth opposite the neck of the superior second molar tooth.ductus parotideus [NA] , Blasius' d., Stensen's d., Steno's d;
Pecquet's d. thoracic d
perilymphatic d. a fine canal connecting the perilymphatic space of the cochlea with the subarachnoid space.ductus perilymphaticus [NA] , aqueductus cochleae, cochlear aqueduct;
pharyngobranchial d.'s See ductus pharyngobranchialis III, ductus pharyngobranchialis IV.
pronephric d. the d. of the pronephros; serves as the mesonephric duct.nephric d;
prostatic d.'s prostatic ductules, under ductule
right d. of caudate lobe the bile duct from the right half of the caudate lobe, a tributary to the right hepatic duct.ductus lobi caudati dexter [NA];
right hepatic d. the duct that transmits bile to the common hepatic duct from the right half of the liver and the right part of the caudate lobe.ductus hepaticus dexter [NA];
right lymphatic d. one of the two terminal lymph vessels, a short trunk, about 2 cm in length, formed by the union of the right jugular lymphatic vessel and vessels from the lymph nodes of the right superior limb, thoracic wall, and both lungs; it lies on the right side of the root of the neck and empties into the right brachiocephalic vein.ductus lymphaticus dexter [NA] , ductus thoracicus dexter [NA];
Rivinus' d.'s minor sublingual d.'s
salivary d. striated d
Santorini's d. accessory pancreatic d
Schüller's d.'s paraurethral d.'s
secretory d. striated d
semicircular d.'s three small membranous tubes in the bony semicircular canals that lie within the bony labyrinth and form loops of about two-thirds of a circle. The three (anterior semicircular d., lateral semicircular d., and posterior semicircular d.) lie in planes at right angles to each other and open into the vestibule by five openings of which one is common to the anterior and lateral ducts. Each duct has an ampulla at one end within which filaments of the vestibular nerve terminate.ductus semicirculares [NA];
seminal d. any one of the d.'s conveying semen from the epididymis to the urethra, ductus deferens, or ejaculatory d.gonaduct (1);
d.'s of Skene's glands paraurethral d.'s
spermatic d. ductus deferens
Stensen's d. , Steno's d. parotid d
striated d. a type of intralobular d. found in some salivary glands that modifies the secretory product; it derives its name from extensive infolding of the basal membrane.salivary d., secretory d;
subclavian d. subclavian lymphatic trunk
submandibular d. the duct of the submandibular salivary gland; it opens at the sublingual papilla near the frenulum of the tongue.ductus submandibularis [NA] , ductus submaxillaris, submaxillary d., Wharton's d;
submaxillary d. submandibular d
sudoriferous d. d. of sweat glands
sweat d. d. of sweat glands
d. of sweat glands the superficial portion of the sweat gland that passes through the corium and epidermis, opening on the surface by the porus sudoriferus or sweat pore.ductus sudoriferus, sudoriferous d., sweat d;
testicular d. ductus deferens
thoracic d. the largest lymph vessel in the body, beginning at the cisterna chyli at about the level of the second lumbar vertebra; the abdominal part extends superiorly to pass through the aortic opening of the diaphragm, where it becomes the thoracic part and crosses the posterior mediastinum to form the arch of thoracic duct and discharge into the left venous angle (origin of the brachiocephalic vein).ductus thoracicus [NA] , Pecquet's d., van Horne's canal;
thyroglossal d. a transitory endodermal tube in the embryo, carrying thyroid-forming tissue at its caudal end; normally, the duct disappears after the thyroid has moved to its definitive location in the neck; its point of origin is regularly marked on the root of the adult tongue by the foramen cecum; occasionally, its incomplete regression results in the formation of cysts along its embryonic course. See also pyramidal lobe of thyroid gland.ductus thyroglossus, thyrolingual d;
thyrolingual d. thyroglossal d
umbilical d. yolk stalk
uniting d. a short membranous tube passing from the lower end of the saccule to the cochlear duct of the membranous labyrinth.ductus reuniens [NA] , canaliculus reuniens, canalis reuniens, Hensen's canal, Hensen's d., uniting canal;
utriculosaccular d. a duct that connects the inner aspect of the utricle with the endolymphatic duct a short distance from its origin from the saccule.ductus utriculosaccularis [NA] , Böttcher's canal;
vitelline d. , vitellointestinal d. yolk stalk
Walther's d.'s minor sublingual d.'s
Wharton's d. submandibular d
Wirsung's d. pancreatic d
wolffian d. mesonephric d
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