RESPIRATORY ORGANS IN ANIMALS AND IN MAN 



^7S 



PLATE LXXVI] 



Fig. 3. 



Fig. 2. 



Fig. 6. 



Fig. 5. 



Fig 8. 



exceedingly thin the walls of the auricles are as compared with those of the left \'eiitricle. The heart beats within the chest, a (so to 

 speak) greater heart. The muscles of the heart and chest are similarly arranged, j, Biglit lung; /c, left lung; I, diaphragm; to, 

 liver ; n, stomach (the Author, 1873). 



Fig. 7.— Anterior half of section of human larynx near its middle. Shows the narrow- aperture or chink (rima glottidis) through 

 which the air passes in respiration and the formation of voice, and which, if Ijy any chance obstructed beyond a few minutes, results 

 in death from suffocation ; also the vocal chords, cartilages, and muscles of the laiynx and the transverse cartilages of the trachea. 

 a. Free part of epiglottis ; h, great oornu of hyoid bone ; c, thyro-hyoid membrane ; cl, thyroid cartilage ; »', cricoid cartilage ; /, first ring 

 of trachea ; y, thyro-arytenoid muscle ; h, inferior thyro-arytenoid ligament in membrane of true vocal chord at the rima glottidis ; 



