DUCT 



399 



DULCAMARA 



directly into the gall-bladder. D.,Hepato-pancreatic, 

 a duct conveying the secretions of the liver and pancreas 

 into the intestinal canal ; the common bile-duct. D., 

 Hermaphrodite, a duct that in hermaphroditic animals 

 receives the male and female elements. D., Hemi- 

 thoracic, an ascending branch of the thoracic duct, 

 given off high in the thorax, and opening either into 

 the right lymphatic duct or close to the angle of union 

 of the right subclavian and right internal jugular veins. 

 D. inferens, in certain Edentata, one of the ducts 

 leading from the submaxillary glands to a common 

 receptacle for the secretion of the gland. D., Inter- 

 cellular, the intercellular canal. See Canal. D., 

 Interlobular, Bile, one of the ducts situated between 

 the lobules of the liver. They are of two varieties, 

 small and large. D., Intralobular, Bile, one of the 

 intralobular canals. See Canal. D., Lachrymal. See 

 D., Nasal. D., Lactiferous. See £>., Galactophorous. 

 D., Leydig's. See D., Mesonephric and D. , Uro- 

 genital. D., Lymph. See D. , Thoracic. D., Lym- 

 phatic. See D. , Thoracic. D., Lymphatic, Left. 

 See D. , Thoracic. D., Lymphatic, Right, the vessel 

 that receives the lymph from the absorbent vessels of 

 the right arm, the right side of the head and neck, the 

 chest, lung and right side of the heart, and also from the 

 upper surface of the liver. It terminates at the junction 

 of the right subclavian and internal jugular veins. D., 

 Mammary. See D., Galactophorous. D., Mesone- 

 phric, an embryonic duct belonging to the mesone- 

 phron, and formed by the longitudinal fission of a por- 

 tion of the segmental duct. In the male, it becomes 

 the vas deferens, while in the female it almost entirely 

 disappears. D., Metanephric, the Ureter, q. v. D., 

 Milk. See D., Galactophorous. D., Muco. See 

 Canal, mucous. D., Mucous. See Canal, mucous. 

 D. of Miiller, a tube (on either side of the body) 

 formed by the undivided portion of the segmental 

 duct, and of the longitudinal tubes into which it 

 divides. From them in the female are developed the ovi- 

 ducts, uterus and vagina, while in the male they atrophy 

 and disappear. D., Nasal, the duct, % an inch long, 

 that conveys the tears from the lachrymal sac into the 

 inferior meatus of the nose. D., Naso-lachrymal. 

 See D. , Nasal. D., Nuckian, one of the excretory 

 ducts of the orbital gland of the dog. D., Omphalic. 

 See D. , I 'itelline. D., Omphalo-mesenteric. See D. , 

 Vitelline. D., Pancreatic, a duct that extends from 

 the pancreas to the duodenum at the point where the 

 common bile-duct enters the bowel. D., Pancreatic, 

 Accessory, the excretory duct of the lesser pancreas, 

 opening into the pancreatic duct or into the duodenum, 

 close to the orifice of the common bile-duct. D., 

 Pancreatic, Supplementary. See D., Pancreatic, 

 Accessory. D., Parotid. See D. of Stcnsen. D. of 

 Pecquet, the thoracic duct. D., Pneumatic, in 

 fishes, the tube that connects the swimming-bladder 

 with the esophagus. D., Pronephric. See D., Seg- 

 mental. D. Prostatic, one of the ducts conveying 

 the secretion of the prostate into the urethra. D., 

 Reticulate, n biology, an aggregation of parenchy- 

 matous tissue-cells, in which the thickenings assume 

 the form of a network. D. reuniens, a small duct 

 leading from the saccule to the membranous labyrinth 

 of the cochlea. D. of Rivini, one of the ducts of 

 the sublingual gland. D., Roriferous. See D., 

 Thoracic. D., Sacculo-utricular, a small canal 

 connecting the saccule of the internal ear with the 

 utricle. D. of Santorini. Same as D., Pancreatic, 

 Accessory. D., Scalariform, in biology, one of numer- 

 ous parallel narrow and elongated bordered pits in 

 plant-cells set close together like the rounds of a ladder. 

 D., Secretory, one of the smaller ducts of a gland, 



tributaries of the excretory duct. D., Segmental, 

 in embryology, a tube, on either side of the body, 

 situated between the visceral and parietal layers of 

 the mesoblast, opening anteriorly into the body-cav- 

 ity, and posteriorly into the cloaca. D., Seminal. 

 See D., E/acuiatory. D., Spermathecal, in certain 

 Alollusca, the duct that connects the spermatheca with 

 the hermaphrodite duct. D., Spermatic, the Vas 

 deferens ; q. 9. D., Spiral, in biology, the prosen- 

 chyinatous cell-tissue, the walls of which are marked 

 by spiral thickenings. D. of Steno. See D. of 

 Sfemten. D., Stenon's. See D. of Stensen. D., 

 Stenonine. See D. of Stensen. D. of Stensen, I. 

 a duct about 2 y z inches long, conveying the secretion 

 of the parotid gland into the mouth, opening on the 

 inner side of the cheek, about opposite to the second 

 upper molar tooth. 2. See Canal, Incisive. D., Sub- 

 lingual. See D. of Rivini and D- of Bartholin. D., 

 Tear, the nasal duct. D., Testicular, the vas de- 

 ferens, q.v. D., Thoracic, a duct 18 to 20 inches 

 long, extending from the receptaculum chyli, in front 

 of the vertebrae as far as the seventh cervical vertebra, 

 where it curves down over the subclavian artery and 

 empties into the left subclavian vein at its junction with 

 the left internal jugular vein. It receives the lymph 

 and chyle not received by the right lymphatic duct. 

 D., Thyroglossus, in the embryo, a duct that termi- 

 nates upon the tongue as the foramen cecum, and leads 

 to the rudiments of the thyroid body. D., Trabecular, 

 in biology, prosenchymatous tissue-cells, in which 

 thickenings cross the lumen of the cell. D., Uro- 

 genital, in biology, a duct that receives the urine and 

 the genital products. D., Uropygial, in birds, a duct 

 leading from the uropygial gland. D., Uroseminal. 

 See D., Uro-genital. D. venosus, the smaller, 

 shorter, and more posterior of the two branches into 

 which the umbilical vein divides after entering the 

 abdomen. It empties directly into the ascending vena 

 cava. After the birth of the fetus it becomes oblit- 

 erated. D., Vitellarian, the canal in which an ovum 

 receives its investment of albuminoid substance. D., 

 Vitelline, a temporary channel of communication be- 

 tween the alimentary canal of the embryo and the 

 umbilical vesicle. D., Vitello-intestinal. See Z>. , 

 Vitelline. D. of Wharton, the duct, about two inches 

 long, of the sublingual gland, opening in the mouth at 

 the side of the frenum linguae. D. of Wirsung, the 

 pancreatic duct. D., Wolffian, the mesonephric duct. 

 D., Yellow. See Canal, Eschricht ' s. 



Ductule (duk'-chul) \_ductulus, a small duct]. A 

 small duct, as the straight seminal ducts. 



Dudgeon's Recipe. A formula for varnish to preserve 

 sphygmographic and cardiography tracings. It con- 

 sists of one ounce of gum dammar dissolved in six 

 ounces of rectified benzolin. 



Dudley's Operation. See Operations, Table of. D. 

 Tests. See Tests, Table of. 



Duflos' Tests. See Tests, Table of. 



Dugas' Test. A method of diagnosis in dislocation of 

 the shoulder. If the hand of the affected side is 

 made to clasp the opposite shoulder, the elbow cannot 

 be made to touch the front of the chest. 



Dugong Oil (du'-gong). The fixed oil afforded by the 

 dugong, Halicore australis, a marine sirenian mam- 

 mal. It is regarded as a good substitute for cod-liver 

 oil. 



Duhring's Disease, or Impetigo. See Impetigo, Der- 

 matitis herpetiformis, and Diseases, Table of. 



Dulcamara (dul-ham-a'-ra) [dulcamara, bitter-sweet]. 

 Bittersweet. The young branches of D. solanum, 

 containing several glucosids and an alkaloid. Its 

 properties are not well understood. It causes nausea*- 



