5.Various Kinds of Epithelial Cells A, columnar cells of intestine; B, polyhedral cells of the conjunctiva; C, ciliated conical cells of the trachea; D, ciliated cell of frog's mouth; E, inverted conical cell of trachea; F, squamous cell of the cavity of mouth, seen from its broad surface; G, squamous cell, seen edgeways.

5.Various Kinds of Epithelial Cells A, columnar cells of intestine; B, polyhedral cells of the conjunctiva; C, ciliated conical cells of the trachea; D, ciliated cell of frog's mouth; E, inverted conical cell of trachea; F, squamous cell of the cavity of mouth, seen from its broad surface; G, squamous cell, seen edgeways.

If we place the fingers on the "Adam's apple," and then pretend to swallow something, we can feel the upper part of the windpipe and the closing of its lid (epiglottis), so as to cover the entrance and prevent the passage of food into the trachea.

The Trachea, or Windpipe.

In its lower part are two openings; the trachea, or windpipe, in front, and the oesophagus behind.

The trachea is surmounted by a box-like structure of cartilage, about four and one-half inches long, called the larynx.

The continuation of the larynx is the trachea, a tube about three-fourths of an inch in diameter, and about four inches long.

Thus the trachea, while always open for the passage of air, admits of the distention of the food-passage.

A, left ventricle; B, right ventricle; C, left auricle; D, right auricle; E, superior vena cava; F, pulmonary artery; G, aorta; H, arch of the aorta; K, innominate artery; L, right common carotid artery; M, right subclavian artery; N, thyroid cartilage forming upper portion of the larynx; O, trachea.

If we only remember that all the bronchial tubes, great and small, are hollow, we may compare the whole system to a short bush or tree growing upside down in the chest, of which the trachea is the trunk, and the bronchial tubes the branches of various sizes. 207.

Apparatus for Illustrating the Movements of Respiration.] It will be noticed that in this experiment the elastic bag and its tube represent the lungs and trachea; and the glass vessel enclosing it, the thorax.

(Anterior view.) A, hyoid bone; B, thyro-hyoid membrane; C, thyroid cartilage; D, erico-thyroid membrane; E, cricoid cartilage, lateral ligaments seen on each side; F, upper ring of the trachea.

A, epiglottis; B, thyroid cartilage; C, arytenoid cartilage; D, ligament connecting lower cornu of the thyroid with the back of the cricoid cartilage; E, cricoid cartilage; F, upper ring of the trachea.

(Showing the vocal cords.) A, epiglottis; B, section of hyoid bone; C, superior vocal cord; D, ventricle of the larynx; E, inferior vocal cord; F, section of the thyroid cartilage; H, section of anterior portion of the cricoid cartilage; K, trachea; L, section of the posterior portion of the cricoid cartilage; M, arytenoid cartilage; N, section of the arytenoid muscle.

Thus, the general shape and structure of the trachea, the larynx, the throat, and mouth all influence the quality of voice.

The first two divisions, or branches, of the trachea; one enters each lung.

The smaller branches of the trachea within the substance of the lungs terminating in the air cells.

Trachea (Gr. trachys, rough).

[20] Otherwise Sherson and Schurschi; which was formerly called Cherson Trachea, and was built 600 years before the Christian era, by the inhabitants of Heraclea in Pontus.

Airpipe N. air pipe, air tube; airhole^, blowhole, breathinghole^, venthole; shaft, flue, chimney, funnel, vent, nostril, nozzle, throat, weasand^, trachea; bronchus, bronchia [Med.]; larynx, tonsils, windpipe, spiracle; ventiduct^, ventilator; louvre, jalousie, Venetian blinds; blowpipe &c (wind) 349; pipe &c (tube) 260; jhilmil^; smokestack.

"So far as I can discover, the piece of ivory has been drawn into the trachea, or windpipe, and has lodged in the mouth of the right bronchus.

I at once telegraphed to London for Morgan, and, between him and Johnson, they have been opening my trachea, and burning my inside with chromic acid and the galvanic cautery.

Rather let us think a little of A.L. Browne, F.R.C.P.!with a breathing-tube in his trachea, and Eternity under his pillow...'

The disease is called "gapes," because they try to open their bills for more air until a red worm in the trachea causes suffocation.

Put it under influence of chloroform, and open into the cavity of the chest; make an incision into the right ventricle, and allow the animal to bleed to death; cut the trachea and inject the lungs with a solution of one and a half drachms of chromic acid in one quart of water, care being taken not to overdistend the lung.