460 



RESPIRATORY SYSTEM OF THE OX 



epiglottis, the angle of the union of the thyroid laminae, and the erico- thyroid 

 membrane. The hyo-epiglotticus muscle is large and bifid. 



THE TRACHEA 



The calilier of the trachea is relatively small, its width being about an inch 

 and a half (ca. 4 cm.) and its height one and a half to two inches (ca. 4 to 5 cm.). 

 The rings are smaller, and number about fifty. In the neck their free ends are sep- 



Frontnl emiyience 



Frontal sinus 



Great ethmo-turbinal 



Superior tui-binnl 



Superior meat us 

 Middle meatus 



Inferior 

 turbinal 



Naso- 

 labial 

 glands 



Inferior 

 meatus 



Body of 

 mandible 



Genio- Mylo-hy- Genio- 

 glossus oidcus hyoideus 



Tliyraid carlilage 



Vic. ,3G5. — Sagittal Siottion or IIkad of Cow. 

 /, Cerebral hemisphere; 2, lateral ventricle; S, thalamus; 4, corijora tiuailrigemina; 



6, optic chiasma; 



6, pituitary body; 7, pons; S, medulla oblongata; 9, cereliellum; 10, sjiinal cord; //, ventral straight nmscles; 

 12, pharyngeal lymj)h gland; l.i, ar.\tenoid cartilage; 14, oi)iKiottis; /5, cricoid cartilage; IG, vocal cord; 17, 

 palatine sinus; />S', soft jjalate; 19, Eustachian opening; Ci, Cj, C3, first, second, and third cervical vertebra^; li.a., 

 basioccipital; .S'/)., presphenoid. 



arated by a varying interval, so that the tube is flattened and membranous dor- 

 sally. In the thorax the ends are in api)osition, so that they form a ridge dorsally. 

 The trachea is adherent to the right lung from the second rib backward. The 

 bifurcation is opposite the fourth intercostal space. 



THE BRONCHI 

 There are three chief })r()nchi. The bronchus for the aj^ical and the anterior 

 cardiac lobe of the right lung is detached from the trachea at a considerable dis- 

 tance anterior to the bifurcation. 



