• Larynx, Trachea, and Bronchial Tubes
    Larynx, Trachea, and Bronchial Tubes
  • WordNet 3.6
    • n trachea membranous tube with cartilaginous rings that conveys inhaled air from the larynx to the bronchi
    • n trachea one of the tubules forming the respiratory system of most insects and many arachnids
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Additional illustrations & photos:

Section of the Larynx and Trachea Section of the Larynx and Trachea

Webster's Revised Unabridged Dictionary
    • Trachea (Bot) One of the large cells in woody tissue which have spiral, annular, or other markings, and are connected longitudinally so as to form continuous ducts.
    • Trachea (Zoöl) One of the respiratory tubes of insects and arachnids.
    • Trachea (Anat) The windpipe. See Illust. of Lung.
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Century Dictionary and Cyclopedia
    • n trachea In anatomy and zoäl.: The principal air-passage of the body; the windpipe, beginning at the larynx and ending at the bronchial tubes. In Arthropoda, as insects, one of the tubes which traverse the body and generally open by stigmata upon the exterior, thus bringing air to the blood and tissues generally, and constituting special respiratory organs. It is a musculomembranous tube, stiffened and held open by a series of many cartilaginous or osseous rings, the first of which is usually specialized (see cricoid), and the last one or more of which are variously modified to provide for the forking of the single tracheal tube into a pair of right and left bronchial tubes (see pessulus). Through the larynx the trachea communicates with the mouth and nose and so with the exterior, and through the bronchial tubes with the lungs; and air passes through it at each inspiration and expiration. The trachea exists in all vertebrates which breathe air with lungs, and is subject to comparatively little variation in character. In man the trachea is a cylindrical membranocartilaginous tube about as thick as one's finger, and 4½ inches long, extending from the sixth cervical to the fourth dorsal vertebra, where it branches into the bronchi, lying along the front of the spinal column, the esophagus interposing between it and the vertebræ. The thyroid body is saddled upon it. Its structure includes many cartilaginous rings, some white fibrous tissue, yellow elastic tissue, muscular fibers, mucous membrane, and glands, besides nerves and blood-vessels. The tracheal rings (see ring) are from sixteen to twenty in number, incomplete in a part of their circumference, being about one third filled in by fibrous tissue. The highly modified first ring, or cricoid, is usually excluded from this association and described as a part of the larynx. Tracheal mucous glands are found in abundance as small flattened oval bodies, with excretory ducts which pierce the fibrous, muscular, and mucous coats to open on the surface of the mucous membrane. The arteries of the trachea are derived from the inferior thyroid; the tracheal veins empty in the thyroid vein; the nerves are from the pneumogastric and recurrent and the sympathetic. The trachea in other mammals resembles that of man. In birds the trachea presents several peculiarities; especially in long-necked birds this organ does not always follow the S-shaped curve of the cervical vertebraæ, and requires special contrivance for shortening and lengthening when the neck is bent and straightened. The whole structure is highly elastic, and the rings are peculiarly beveled on opposite sides alternately, so that each one may slip half over another to right and left. In some long-necked birds, as cranes and swans, the windpipe makes large folds or coils in the interior of the breast-bone or under the skin of the breast. The rings are prone to ossify in birds, and some of them are often greatly enlarged in caliber and soldered together into a large gristly or bony capsule, the tracheal tympanum, also called labyrinth. Besides its intrinsic muscles, the trachea is provided with others which pass to the furculum or sternum, or both. The lower end of the trachea is peculiarly modified in nearly all birds to form the lower larynx, or syrinx. See syrinx, 4 (with cut), also cuts under larynx, lung, pessulus.
    • n trachea In botany, a duct or vessel; a row or chain of cells that have lost their intervening partitions and have become a single long canal or vessel. They may be covered with various kinds of markings or thickenings, of which the spiral may be taken as the type. See vessel.
    • n trachea A notable genus of noctuid moths, containing one species, T. piniperda, known to English collectors as the pinebeauty. It is a common pest to pine and fir forests in Scotland and through northern and central Europe. The larva is slender, naked, and green, with three white lines on the back and a yellow or red line on the sides, and feeds on the older pine-needles. It passes the winter as pupa on or under the ground. This genus was named by Hübner in 1816.
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Chambers's Twentieth Century Dictionary
    • n Trachea tra-kē′a that part of the air-passages which lies between the larynx and the bronchi
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Webster's Revised Unabridged Dictionary
NL.,from L. trachia, Gr. trachei^asc. windpipe), from rough, rugged: cf. F. trachée,
Chambers's Twentieth Century Dictionary
L. trachīa—Gr. trachys, tracheia, rough.


In literature:

Each side has a white edging of shrivelled tracheae, running from one stigmatic orifice to another.
"The Glow-Worm and Other Beetles" by Jean Henri Fabre
Through these the air passes into a system of air-tubes, the tracheae.
"Insects and Diseases" by Rennie W. Doane
When the food is in the pharynx, how is it prevented from passing into the trachea, or windpipe?
"A Treatise on Anatomy, Physiology, and Hygiene (Revised Edition)" by Calvin Cutter
Thus: "This person has been drowned, for he has froth in the trachea".
"Logic, Inductive and Deductive" by William Minto
Probably tracheae have developed independently by the same process in several groups of tracheate Arachnids.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3" by Various
A microscopic examination of a portion of one of the tracheae will show that its walls are supported by an elastic spiral of a firm substance.
"Butterflies and Moths" by William S. Furneaux
Tracheae are abundant just in proportion as blood-vessels become suppressed.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 6" by Various
At the top of the trachea is the larynx, a sort of {126} box of cartilage, across which are stretched the vocal cords.
"A Treatise on Physiology and Hygiene" by Joseph Chrisman Hutchison
They lack eyes and tracheae.
"Handbook of Medical Entomology" by William Albert Riley
Mounted preparations of mouth parts and tracheae.
"A Guide for the Study of Animals" by Worrallo Whitney

In news:

To form words, air is first breathed through the trachea as the vocal folds, or cords, vibrate.
Pleomorphic adenoma of the trachea.
Primary pleomorphic adenoma of the trachea is rare, as only 33 cases have been previously reported worldwide since 1922.
The InBreath bioreactors for tubular organ regeneration is designed for tissue engineering and regenerative medicine research applications using trachea, esophagus, intestines, blood vessels, or any hollow organ.
Cause of damage to patient's lung, trachea is contended.
Computed tomography and magnetic resonance imaging showed a polypoid mass in the trachea .
Johnson designed and built the nanofiber tracheal scaffold to match the dimensions of the patients trachea , while Harvard Bioscience produced a specifically designed bioreactor used to seed the scaffold with Mr Lyles own stem cells.
Imaging techniques-particularly computed tomography-are beneficial for diagnosing a tracheal diverticulum because bronchoscopy can sometimes miss the point of communication with the trachea .
It is an air-filled tubular structure, most often found posterior and slightly to the right of the trachea and communicating with the trachea .
The CT scan of the chest showed a 2 * 2 cm tubular air-filled structure on the right side of the thoracic inlet, posterior and lateral to the trachea (Figure 2A and B).
The trachea, or windpipe, carries air from the larynx to the bronchi and lungs.
A slide show depicting a surgical procedure to create an opening through the neck into the trachea (windpipe).
Had condition that narrowed trachea.
Office-based procedures for the larynx, trachea, and esophagus.
Doctors have begun performing surgeries to replace windpipes, or tracheas, with plastic scaffolding seeded with a patient's own cells.