tube

A tubular or trumpet-shaped canal. absorption t. A graduated gla t., about 250 mm. long and 20 mm. in diameter, closed at one end and furnished with a lip at its open end; used in Bunsen's method of volumetric analysis, auscultation t. A t. for testing the hearing power, binocular t. The t. of a binocular microscope. bronchial t's. The branches into which the bronchi divide and from which spring the smaller t's (bronchioles) that communicate with the pulmonary alveoli. Crookes' t. See Crookes. drainage t. A t. of soft rubber or other material perforated at one end with small holes, to be introduced into a wound or suppurating cavity to allow of the escape of fluids, draw t. A t. sliding within the main t. of a microscope, used to increase or diminish the t. length, eudiometer t. See eudiometer (2d def.). eustachian t. The canal which connects the pharynx and the tympanic cavity and by which an exchange of air takes place between the atmosphere and that cavity, fallopian t. See oviduct. Gei ler's t. See Gei ler. hearing. t. An ear tube for the use of deaf persons in conversation. Henle's loop t. See Henle. Kobelt's t's. See Kobelt. loop t. See Henle's loop t. lymph t's. The lymphatic ve els, medullary t. In embryology, the medullary or neural canal, the primary form of the brain and spinal marrow, formed by the union of the medullary ridges over the medullary groove, mi croscopic t. The cylindrical metal X blackened on its internal surface that contains the objective, eyepiece, and draw t., if there is one, of a microscope. O'Dwyer's t. See O'Dwyer. ovarian t's. Ovular (or egg chains; germinal epithelium in a developing ovary; divided into t's or chain like ma es by vascular ingrowths from the ovarian stroma. Pfliiger's salivary; t's. gland, Ducts within the lobules of a salivary receiving t. of the kidney. See collecting tubule, under tubule, rectal t. An elastic gum t. to be pa ed into the rectum. Ribemont's laryngeal t. See Ribemont. safety t. A small part of the upper portion of the eustachian t. which lies in the curve formed by the cartilage as it turns forward under the cartilaginous hook. It is always sufficiently open to allow a recoil of air to occur from the drum cavity if the drumhead is suddenly driven in, as in explosions, and also to permit of a slow equalization of pre ure in the tympanic cavity from the pharynx. speaking t. See hearing t. spray t. A combination of two t's with fine nozzles placed at right angles so that a current of air or steam through one will cause a spray of fluid to i ue from the other, stomach t. A long t., made of rubber or other material, used for lavage of the stomach, straight t. See collecting tubule, under tubule, tracheotomy t. A curved silver t., used to keep the opening in the trachea free after tracheotomy. uriniferous t's, uriniparous t's. See uriniferous tubules, under tubule. [Lat., tuba, a trumpet.]