DRYSDALE'S CELLS OR CORPUSCLES 



398 



DUCT 



Drysdale's Cells or Corpuscles. Certain microscopic 

 cells in ovarian fluid, generally round, sometimes oval 

 in form, transparent, containing fine granules, but no 

 nucleus. They have been described as pathognomonic 

 of ovarian cysts, but this is disputed. 



Dualin (du' -al-in) [dual, of two]. An explosive com- 

 posed of a mixture of nitro-glycerin 50 parts and 

 nitrated sawdust 5° parts. Giant powder and retid- 

 rock are similar mixtures. 



Dualism (dzt'-al-izm) [duo, two]. A system by which 

 natural phenomena are explained upon two principles. 

 D., Chancrous, the theory of the existence of two 

 forms of chancre — the non-infecting, or soft chancre, 

 and the infecting, or true (hard) chancre. 



Dualistic {ilu-al-is'-tik) [dual, of two]. Characterized 

 by duality. D. Theory of the Composition of 

 Carbon-compounds ; every chemic compound is 

 composed of two groups, electrically different, and 

 these are further made up of two different groups 

 or elements. The Electro-chemic, dualistic theory of 

 Berzelius was prevalent in Germany until about i860. 



Duality (du-al'-it-e) [dualilas, dual]. Dualism; the 

 supposed distinction, and potentially independent ac- 

 tion, of each of the cerebral hemispheres. 



Dubini's Disease. " Electric chorea ;" myelitis con- 

 vulsiva; a malady met with in Italy, differing from 

 chorea in the character of the movements, which are 

 sudden and shock-like ; in the course of the disease, 

 which is progressive and often fatal ; and in the ad- 

 dition of muscular palsy and wasting. Its etiology 

 and pathology are obscure. See Diseases, Table of. 



Dublin Method. See Treatment, Methods of. 



Dubois' Caustic. See Caustic. 



Duboisia (du-bois' -e-ah) [after Dubois, a French botan- 

 ist]. The leaves of D. myoporoides, an Australian 

 tree. It resembles belladonna in physiologic and 

 therapeutic effects. D., Ext. Dose gr. ]/e~%- D., 

 Ext. Fid. Dose n\ v-x. D., Tinct. Dose VC^ v-xx. 



Duboisin {du-bois'-iri) [after Dubois, a French botanist], 

 C 70 H 23 N 6 O. An alkaloid from Duboisia myoporoides, 

 identical with hyoscyamin. 



Dubrueil's Operation. See Operations, Table of. 



Duchenne's Disease. See Diseases, Table of. D. 

 Paralysis. See Diseases, Table of. D.-Aran Type 

 of Muscular Atrophy. See Diseases, Table of. 



Duck-bill Forceps. See Forceps. D. Speculum. 

 See Speculum. 



Duckett's Closet. See Sezuage, Disposal of. 



Duck-foot {duk'-fooi). Synonym of Flat-foot. 



Duck-legged (duk-leg'-ed). Having very short legs. 



Duck-weed Disease {duk'-ived dis-ez'). A German 

 name for tuberculosis in cattle. 



Duckworth's Theory. The neuro-humoral theory of 

 the origin of gout. It is that there is a basic, arthritic 

 stock, a diathetic habit, of which gout and rheumatism 

 are two distinct branches. The gouty diathesis is 

 expressed in (a) an abnormality of the nerve-centers, 

 which may be inherited or acquired ; and (b) a peculiar 

 incapacity for normal elaboration within the whole 

 body, whereby uric acid is formed at times in excess 

 or is incapable of being duly transformed into more 

 soluble and less noxious products. 



Duct, or Ductus [ducere, to lead]. A tube for the con- 

 veyance of the fluids of the body. D., Aberrant, a 

 small, blind, coiled tube, 2 to 14 inches in length, run- 

 ning from the lower portion of the canal of the epi- 

 didymis. D., Aberrant Bile, one of a number of 

 biliary ducts, occasionally found in the left lateral 

 ligament of the liver. They are not surround 

 lobules and are the remains of hepatic substance, 

 '•nt at an early stage of development. D., Acous- 

 tic, the external auditory meatus. D., Adipose, one of 



the sacs in cellular tissue containing the fat. D., Air, 

 in biology, one of the intercellular spaces in aquatic 

 plants, containing air. D., Alimentary. See D. , 

 Thoracic. D., Alveolar, one of the infundibula of 

 the bronchioles. D., Annular, in biology, one of 

 the ring-shaped thickenings of the cells of vascu- 

 lar tissue. D. of Arantius. See D. venosus. D., 

 Archinephric. See D., Mesonephric. D., Arterial. 

 See D. arteriosus. D. arteriosus, a short vessel in 

 the fetus between the main pulmonary artery and the 

 aorta. It becomes obliterated at birth. D., Auditory, 

 the space between the membrana tectoria and the 

 membrana basilaris of the cochlea. D. of Bartholin, 

 the larger and longer of the sublingual ducts, opening 

 into the mouth near to, or in common with, Wharton's 

 duct. D. of Bellini, one of the excretory tubes of the 

 kidneys. D., Biliary. See D. , Common Bile. D. 

 of Botal. See D. arteriosus. D., Branchial, in 

 Myzontes, a short tube between the branchial pouch 

 and the intestinal cavity. D., Canalicular, one of 

 the smaller galactophorous ducts of the mammce. 

 D., Cement, in Cirripedia , one of a number of tubes 

 that pass through the antennae from the cement-glands. 

 D. choledochus. See D., Common Bile. D., 

 Cochlear. See Canal, Cochlear. D., Common 

 Bile, a duct about three inches long formed by the 

 union of the cystic and hepatic ducts, and convey- 

 ing the bile to the duodenum. D. of Cuvier, in 

 the fetus, one of two short transverse venous trunks, 

 on either side, opening into the auricle of the heart, 

 each being formed by the union of a superior vein, 

 the primitive jugular, and an inferior vein. The right 

 one becomes the superior vena cava ; the left one 

 disappears. D., Cysthepatic. See Hepato-cystic . 

 D., Cystic, the excretory duct of the gall-bladder; 

 it is about i l /i inches long, runs backward, downward, 

 and to the left and unites with the hepatic duct to form 

 the common bile-duct. D. of Darwin. See D., 

 Cement. D., Definitive, one of the straight milk-ducts 

 in the nipple. D., Efferent. Same as Canal, Deferent. 

 D., Egestive. See D., Excretory. D., Ejaculatory, 

 a duct about an inch long, on either side of the body, 

 formed by the union of the vas deferens and the seminal 

 vesicle. The semen passes through it into the urethra. 

 D., Endolymphatic, a tubular process of the mem- 

 branous labyrinth of the ear, passing through the 

 aqueduct of the vestibule into the cranial cavity, where 

 it terminates below the dura mater in a blind enlarge- 

 ment, the sacculus endolymphaticus. D., Esophago- 

 cutaneous, in biology, a duct joining the esophagus 

 with the branchial pore, and thus with the exterior. D., 

 Excretory, the tube through which the secretion of a 

 gland is discharged. D., Galactophorous, one of 

 the 15 or 20 milk-ducts of the lobes of the mammary 

 glands. They converge toward the areola, and ter- 

 minate upon the surface of the nipple in small de- 

 pressions. D., Gall. See D., Bile, D. , Hepatic, and 

 D. , Cystic. D. of Gartner, the canal of Gartner. 

 See Canal. D., Genital, the genital canal. See 

 Canal. D., Guttural, the Eustachian tube. D., 

 Hepatic, a duct, 1% inches long, formed al tin- margin 

 of the transverse fissure of the liver by the right ami 

 left hepatic ducts. It unites with the cystic duet to 

 form the common bile-duct. D., Hepatic, Left, a 

 duct arising from the left lobe of the liver, and joining 

 the right hepatic duct to form the common hepatic 

 duet. D., Hepatic, Middle, an occasional branch 

 of the hepatic duct, conveyingthe bile from the quad- 

 lobe of the liver. D., Hepatic, Right, a duet 

 arising from the right lobe of the liver, and joining t lie 

 left hepatic duct, to form the common hepatic duct. 

 D., Hepato-cystic, one of the biliary ducts emptying 



