Duct

or Ductus. A tube for the conveyance of the fluids of the body. D., Aberrant, a small, blind, coiled tube, 2 to 14 inches in length, running from the lower portion of the canal of the epididymis. 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., Acoustic, the external auditory meatus. D., Adipose, one of the sacs in cellular ti ue 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 vascular ti ue. D. of Arantius. See D. venosus. D., Arch i nephric. See D., Mesonephric. D., Arterial. See D. arteriosus. D. arteriosus, a short ve el 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 basilar is 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 Cirriped i a, one of a number of tubes that pa 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 conveying 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., Cyst hepatic. See Hepato-cystic. D., Cystic, the excretory duct of the gall-bladder; it is about il/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.