RESPIRATION. 



451 



pharynx. The former are constantly open, in which state 

 they are retained by two curved cartilages, placed back to 



Fig. 124. Antero-posterior section of the head, showing the entire mouth, pharynx, 

 and nasal cavities. 1. Genio-hyoglossus ; 2. Genio-hyodeus ; 3. Section of the soft 

 palate: 4. Pharynx; 6. (Esophagus; 6. Guttural pouch; 7. Pharyngeal opening of the 

 Eustachian tube; 8. Cavity of the larynx; 9. Ventricle of the larynx; 10. Trachea; 11. 

 Superior turbinated bone ; 12. Inferior turbinated bone ; 13. Ethmoid cells ; 14. Portion 

 of the cranial cavity which lodges the brain proper; 15. Portion of the same, which 

 lodges the cerebellum; 16. Falx cerebri; 17. Tentorium; 18. Upper lip; 19. Lower lip. 



back in the median line, and supporting the muscles, glands, 

 adipose tissue, and skin of the nose. These cartilages form 



