EXTERNAL ANATOMY OF THE HORSE's HEAD 171 



4. The trachea, or windpipe, with its rings. 



5. One of the chordce vocales, or cords concerned in the 



voice. 



6. The saccidiLS laryngis^ or the sac or ventricle of the larynx, 



or throat, for the modulation of the voice. 



7. The opening from the back part of the mouth into the 



nostril. 



8. The soft palate at the back of the mouth, so constructed 



as nearly to prevent the possibility of vomiting by the 

 mouth. 



9. The muscle of the neck, covered by the membrane of the 



back part of the mouth. 



10. The cricoid, or ring-like cartilage below and behind the 



thyroid. 



11. The oesophagus, or gullet. 



15. A portion of the os hyoides^ or bone of the tongue. 



REPRESENTATION OF THE PALATE AND 

 TEETH. 



PLATE III, Fig. 2. 



a^ a. The tushes canines, or tusk-formed teeth. 

 b^ b. The incisors, nippers, or cutting teeth, 

 c, c. The palatine nerve between the artery and the vein. 

 d, d. The palate, divided into ridges and bars. 

 ^, e. The palatine artery. 

 /,/. The palatine vein. 

 g^ g. A strip of the palate, dissected up, to exhibit the position 



of the vessels and nerve beneath. 

 k, k. The cheeks. 

 z] L The molars, or grinding teeth. 



EXTERNAL ANATOMY OF THE HORSE'S HEAD. 



PLATE III, Fig i. 



«, a. The orbicularis muscles, surrounding the eye, and destined 

 for the purpose of closing the eyelids. 



