. The comparative anatomy of the domesticated animals. Veterinary anatomy. 472 TEE BESPIRATOBT APPABATUS IN MAMMALIA. Internally, the humaQ larynx has no subepiglottio or subarytenoid sinus like that of Solipeds, though it has lateral, or Morgagni's, ventricles that uscend a little to the outside of the superior vocal cords. 2. Trachea.—3. Bronchi.—There is little difference to be remarked in these. The trachea is about four inches long and about one inch wide, and is composed of about twenty C-shaped rings, which are closely united, as in animals. It is situated in the median plane, in the up
. The comparative anatomy of the domesticated animals. Veterinary anatomy. 472 TEE BESPIRATOBT APPABATUS IN MAMMALIA. Internally, the humaQ larynx has no subepiglottio or subarytenoid sinus like that of Solipeds, though it has lateral, or Morgagni's, ventricles that uscend a little to the outside of the superior vocal cords. 2. Trachea.—3. Bronchi.—There is little difference to be remarked in these. The trachea is about four inches long and about one inch wide, and is composed of about twenty C-shaped rings, which are closely united, as in animals. It is situated in the median plane, in the upper part of the neck, where it is embraced by the lobes of the thyroid gland; at its entrance into the chest it deviates slightly to the right. The two short canals between its lower extremity and the lungs are the bronchi; the right bronchus is the shortest and widest, and Las an almost horizontal direction, entering the right lung at the fourth dorsal vertebra; the left is longer and less voluminous, and reaches the corresponding lung at the fifth vertebra. 4. Lungs.—The luugs weigh about forty ounces. As in all animals, the right is more voluminous than the left, and is divided into three lobes ; the latter has only two. The inferior vena cava is not surrounded by pulmonary tissue; the principal lobes are partitioned into lobules, which are visible on the surface, and on the limits of which are deposited, only in the adult, a notable quantity of pigmentary matter, that gives the lungs the appearance of a chess-board. There is nothing to be said respecting their internal conformation and structure. THE GLANDIFOHM BODIES CONNECTED WITH THE KESPIBATOEY APPAKATtTS. 1. Thyroid Body (or Gland). The thyroid gland, or body, is composed of two oval lobes of a reddish- brown colour, and'is situated close to, and behind, the larynx, beside the two first rings of the trachea. These two lobes, distinguished as right and left, appear at first sight to be perfectly independent; but a
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