noun
definition
A pipe, tube or canal which carries gas or liquid from one place to another.
example
heating and air-conditioning ducts
definition
An enclosure or channel for electrical cable runs.
definition
Guidance; direction.
verb
definition
To channel something through a duct (or series of ducts).
Examples of duct in a Sentence
On the other hand, the ejaculatory duct with its verticillate sac in the male of Cypris and other genera is a feature scarcely less remarkable.
Into this also opens the genital duct from the single or paired gonad (ov).
The right and left hepatic ducts, while still in the transverse fissure, unite into a single duct which joins the cystic duct from the gall bladder at an acute angle.
It is known the duct of Gartner, and.
Inasmuch as the stone is blocking the duct, the bile is unable to flow into the intestine; so, being absorbed by the blood-vessels, it gives rise to jaundice.
The genital duct opens by a pore into the urino-genital groove of the oyster (the same arrangement being repeated on each side of the body) close to but distinct from the aperture of the nephridial canal.
Solenomya, in which the gonad opens into the reno-pericardial duct.
These forms are hermaphrodite, with an ovary and testis completely separate from each other on each side of the body, each having its own duct and aperture.
In the Scaphopoda there is no distinct genital duct, the relations are as in Aspidobranchia.
It is frequently armed with spines, hooks or stylets, and is further complicated by the addition of a nutritive secretion (the prostate gland) which may open at its base or pass separately by a special duct to the exterior.
The spermatozoa enter it and pass through its walls and traverse a minute duct formed of two accessory cells, and finally enter the ripe ovum.
In the same and other leading forms a pair of much-coiled glandular tubes, the coxal glands (coelomocoels in origin), is found with a duct opening on the coxa of the fifth pair of appendages of the prosoma.
But, on the ground of their air-bladder being closed, or deprived of a pneumatic duct communicating with the digestive canal, such as is characteristic of the Malacopterygians, they were removed from them and placed with the flat-fishes, or Pleuronectidae, in a suborder Anacanthini, regarded as intermediate in position between the Acanthopterygians, or spiny-finned fishes, and the Malacopterygians.
In diabetes this organ seems to play a part which is not yet precisely determined; and one fell disease at least has been traced to a violent access of inflammation of this organ, caused perhaps by entry of foreign matters into its duct.
Tnis duct (Laurer's canal) is sometimes rudimentary and ends blindly beneath the skin.
In the endoparasitic trematodes the uterus is the only passage by which fertilization can be effected, and in cases of cross and selfimpregnation this duct is physiologically a vagina.
The ovary (a) leads into (bb) the oviduct, which is joined at (g) by the duct of the yolk-glands (h).
A, Dorsal view showing the nervous system and digestive system; a, mouth; b, pharynx; c, d, e, gut; E, post-genital union of two limbs of gut; f, excretory pore; g, vaginal pore; h, j, k, brain and nerves; 1, dorsal nerves; m, ventral nerves; n, adoral sucker; o, posterior sucker; p, hooks on posterior sucker; r, vitello-intestinal duct.
Among the Gastropoda, in the Aspidobranchia, there is no genital duct, and the gonad opens into the right kidney; in the more modified forms the left kidney alone is functional, the right has been converted into the genital duct.
Meinert, open to the exterior by a median aperture, the terminal part of the duct being single, either by the fusion of the primitive paired ducts or by the suppression of one of them.
On this view then the Aplacophora are more primitive than the Polyplacophora in the relations of coelom, gonad and coelomoducts; and the genital ducts of the Chitons have arisen either by metameric repetition within the group, or by the gradual loss of an original connexion between the generative sac and the renal tube, as in Lamellibranchs and Gastropods, the generative sac acquiring a separate duct and opening to the exterior on each side.
In the skull there are two orifices to the lachrymal duct, situated on or inside the rim of the orbit.
A curious duct with lateral branches termed the supra-intestinal organ lies above the intestine in the female.
All the cavities of a side are ultimately in communication with an efferent duct opening on the surface of the body a little above the line of attachment of the gills.
The ova are fertilized in the genital duct, and before their escape have undergone the earliest stages of segmentation.
There is a more or less convoluted tube with glandular walls connected internally with a closed " endsac " and opening to the exterior by means of a thin-walled duct.
The external duct of this gland is often dilated into a bladder, and may sometimes send out diverticula, forming a complex system of sinuses ramifying through the body.
The gonad, whose position has already been mentioned, is divided into transverse lobes; its duct is anterior and single, and diverges to the right to open into the right kidney as in primitive Gastropods and Lamellibranchs.
The first member of the series is 3; the second is the product of n 1 two numbers, each equal to 3; the third is the pron e duct of three numbers, each equal to 3; and so on.
Which of the coelomic cavities this last is connected with is uncertain, for there is considerable doubt as to the origin of the genital glands in the embryonic development of recent echinoderms. It seems clear, however, that there was but a single duct and a single bunch of reproductive cells, as in the holothurians, though perhaps bifurcate, as in some of those animals.
Since this must have, on our theory, enclosed the parietal canal from the anterior coelom, it is possible that the genital products were developed from the lining cells of that cavity, and that the genital pore was nothing but its original pore not yet united with that from the water-sac. The concrescence of these pores can be traced in other cystids; but as the genital organs became affected by radial symmetry the original function of the duct was lost, and the reproductive elements escaped to the exterior in another way.
Its duct leaves the inferior anterior angle, at first descends a little, and runs forward under cover of the rounded inferior border of the lower jaw, then curves up along the anterior margin of the masseter muscle, becoming superficial, pierces the buccinator, and enters the mouth by a simple aperture opposite the middle of the crown of the third premolar tooth.
There is no gallbladder, and the biliary duct enters the duodenum about 6 in.
The principal duct enters the duodenum with the bileduct, and there is often a second small duct opening separately.
The nephridia of the first three pairs of legs are smaller than the rest, consisting only of a vesicle and duct.
In all the species except the African species there is a globular receptaculum seminis opening by two short ducts close together into the oviduct, and in the neotropical species there is in addition a small receptaculum ovorum, with extremely thin walls, opening into the oviduct by a short duct just in front of the receptaculum seminis.
Besides the other spaces are definite rounded or oval vacuoles with a permanent pellicular wall termed by Schutt " pusules "; these open by a duct or ducts into the longitudinal groove.
In most male batrachians the testes are drained by transverse canals which open into a longitudinal duct, which also receives the canals of the kidneys, so that this common duct conveys both sperma and urine.
In some of the discoglossid frogs, however, the seminal duct is quite independent of the kidney, which has its own canal, or true ureter.
The sphincter of Oddi surrounds the ampulla and prevents reflux of duodenal contents into the pancreatic duct.
The stent clears a passage through the bile duct to allow the bile duct to allow the bile to drain away.
The thyroglossal duct extends from the foramen caecum, in the floor of the mouth, to the hyoid bone.
For this reason, we prefer to tie the cystic duct using a catgut Roeder external slip knot.
Our results indicate that DNA ploidy is an important, prognostic factor of carcinoma of the hepatic duct confluence.
Dust - duct entries are cut out using a standard hole saw mounted on a cordless drill.
Both gas and electric clothes dryers work by heating air that is blown through a duct into a.. .
The surgery may involve measures to improve drainage of the pancreatic duct, partial or complete removal of the pancreas.
This is joined by the cystic duct from the gall bladder, which then forms the common bile duct.
The Liver and Biliary Tract The biliary tract contains the right and left hepatic ducts, which meet to form the common hepatic duct.
The stent clears a passage through the bile duct to allow the bile to drain away.