tube (toob) a hollow cylindrical organ or instrument.
neural tube,
auditory tube eustachian tube; the narrow channel connecting the middle ear and the nasopharynx. 
)
drainage tube a tube used in surgery to facilitate escape of fluids.
Durham's tube a jointed tracheotomy tube.
endobronchial tube a double-lumen tube inserted into the bronchus of one lung to deflate the other lung for anesthesia or thoracic surgery.
endotracheal tube an airway catheter inserted in the trachea in endotracheal intubation.
esophageal tube stomach t.
eustachian tube auditory t.
fallopian tube uterine t.
feeding tube one for introducing high-caloric fluids into the stomach.
Miller-Abbott tube a double-channel intestinal tube with an inflatable balloon at its distal end, for use in treatment of obstruction of the small intestine, and occasionally as a diagnostic aid.
nasogastric tube a soft tube to be inserted through a nostril and into the stomach, for instilling liquids or other substances, or for withdrawing gastric contents.
nasotracheal tube an endotracheal tube that passes through the nose.
neural tube the epithelial tube developed from the neural plate and forming the central nervous system of the embryo.
orotracheal tube an endotracheal tube that passes through the mouth. 
)
Orotracheal tube.
otopharyngeal tube , pharyngotympanic tube auditory t.
Sengstaken-Blakemore tube a multilumen tube used for tamponade of bleeding esophageal varices. 
)
Sengstaken-Blakemore tube for esophagogastric tamponade.
stomach tube a tube for feeding or for stomach irrigation; the most common kind is the nasogastric tube.
test tube a tube of thin glass, closed at one end; used in chemical tests and other laboratory procedures.
tracheal tube endotracheal t.
tracheostomy tube a curved endotracheal tube that is inserted into the trachea through a tracheostomy.
uterine tube fallopian tube; a slender tube extending from the uterus toward the ovary on the same side, for passage of oocytes to the cavity of the uterus and the usual site of fertilization. 
)
Uterine, or fallopian, tube.
Wangensteen tube a small nasogastric tube connected with a special suction apparatus to maintain gastric and duodenal decompression.
x-ray tube a vacuum tube used for the production of x-rays; when a suitable current is applied, high-speed electrons travel from the cathode to the anode, where they are suddenly arrested, giving rise to x-rays. 
)
Standard stationary anode x-ray tube; diagram in longitudinal section.
| neural tube n. A dorsal tubular structure in the vertebrate embryo that develops into the brain and spinal cord. |
neural tube,
the longitudinal tube, lying along the central axis of the early developing embryo, that gives rise to the brain, spinal cord, and other neural tissue of the central nervous system. Also called cerebromedullary tube, medullary tube. See also neural tube defect.
neural
pertaining to a nerve or to the nerves.
neural crest cells
a group of neuroepithelial cells which condenses dorsal to the neural tube in the embryo; they subsequently migrate and set up dorsal root ganglia, the ganglia of the autonomic nervous system, and the pigment cells of the integument (melanocytes).
neural folds
in the embryo, the sides of the invaginated neural plate that meet and fuse over the neural groove to form the neural tube.
neural groove
the longitudinal furrow in the neural plate of the embryo.
neural lymphomatosis
see marek's disease.
neural plate
the thickened ectoderm dorsal to the notochord in the embryo that gives rise to the neural tube.
neural retina
separated from the outer layer of the optic retina by the intraretinal space; constitutes the pars optica retinae, with its neuroepithelial layer (contains rods and cones—the receptor cells), bipolar ganglion layer, multipolar ganglion layer, and a layer of axons of the latter layer. Light must pass through the latter three layers before reaching the receptor cells.
neural substrates
functional units of the central nervous system, often composed of a series of structural units which may be widely separated anatomically but which interact to support or drive complex nervous system functions, such as hunger and sleepiness. They are the counterparts of simple centers, e.g. the respiratory center, which control simple physiological mechanisms.
neural tropic influence
the tropic influence of nerves on, for example, muscle, demonstrated by the atrophy of muscle when it is denervated.
neural tube
the precursor of the central nervous system in the embryo, formed by invagination and fusion of the neural plate.
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