duct

A canal for conducting the secretion of a gland. In some instances the term is applied to canals that conduct material other than the secretion of a gland. aberrant bile d's. Biliary d's not surrounded by lobules, occasionally found in the left lateral ligament of the liver and in the fibrous bands which bridge over the fo a of the vena cava and the umbilical fi ure, acce ory pancreatic d. The excretory d. of the tail of the pancreas, opening into the pancreatic d. or into the duodenum close to the orifice of the common bile d. alimentary d. See thoracic d. alveolar d's. The in^ fundibula of the bronchioles. arch i nephric d. See mesonephric d. bile ducts. Tubes conveying bile, as the cystic d., hepatic d., common bile d., interlobular d. biliary d's. ofThethed's liver. situated between the lobules capillary bile d's. See intra lobular biliary canals, under canal. cochlear d. The cochlear canal. common bile d. A d. about 3 inches long, formed by the union of the cystic and hepatic d's, which carries the bile to the intestines, and empties, in common with the pancreatic duct, at a point 3 or 4 inches beyond the pylorus in the ampulla of Vater. common seminal d. See ejaculatory d. Cuvier's d's. See under Cuvier. cystic d. A d. about 1 y2 inches long, situated on the lower surface of the liver, which unites with the hepatic d. to form the common bile d. definitive d's. The straight milk d's in the nipple, d's of Rivini. The d's of the sublingual gland, d. of Sant or in i. See acce ory pancreatic d. d. of Wirsung. See patu creatic d. ejaculatory d. A d., one on each side, through which the semen pa es into the urethra. It is formed by the union of the vas deferens and the seminal vesicle, and is a little more than an inch long. It pa es through the prostate and opens by a slit on the side of the verumontanum. excretory d. The tube or channel through which the secretion of a gland is discharged. galactophorous d's. The milk d's of the lobes of the mammary gland. They are from 15 to 20 in number, are composed of an areolar, a muscular, and an epithelial layer, and converge toward the areola, beneath which they are dilated into the • ampullae, then pa into the nipple, and terminate upon its surface in small depre ions, gall d's. See bile d's, hepatic d., and cystic d.' Gartner's d. See under Gartner, genital d. The genital canal, guttural d. The eustachian tube. hepatic d. A d. about iJ/2 inches long, which is formed by the union of the right and left hepatic d's and pa ing downward unites with the cystic d. hep a to cystic d's. Biliary d's which, in many of the lower animals and occasionally in man, empty directly into the gall-bladder, intra lobular bile d's. The d's situated between the lobules of the liver. They unite to form larger d's lying in the portal canals, which, in turn, unite finally into the right and left hepatic ducts. See intra lobular biliary canals, under canal.