THE HEAD AND NECK. 



107 



3. The cricoid cartilage and crico-thyroid membrane. (Fig. 67.) 



4. The arytenoid cartilages surmounting the cricoid cartilages. 



5. The epiglottis in the retiring angle of the thyroid cartilage. (Fig. 69.) 



6. The mucous membrane of the larynx. 



7. The superior laryngeal nerve of the vagus nerve. (Figs. 63 and 71.) 



8. The inferior laryngeal nerve (the recurrent branch figure 71) of the 



vaeus. 



GREATER CORNU OF HYOID 



BONE 

 BODY OF HYOID BONE 



Thyro-hyoid ligament 



EPIGLOTTIS 



Median notch 



Origin of thyro-epiglottic 



ligament 

 POSTERIOR EDGE OF THYROID 



CARTILAGE 



Origin of thyro-aryte- 

 noideus muscle 



INFERIOR CORNU 



SMALLER CORNU OF HYOID 

 BONE 



CARTILAGO TRITICEA 



SUPERIOR CORNU OF THYROID 

 CARTILAGE 



RIGHT ALA OF THYROID 

 CARTILAGE 



False vocal cord 

 True vocal cord 



Origin of thyro-epiglot- 

 tideus muscle 



FIG. 69. POSTERIOR VIEW OF THYROID CARTILAGE WITH EPIGLOTTIS. 



9. The superior laryngeal artery, a branch of the superior thyroid artery. 

 (Fig. 28.) 



10. The sympathetic nerve with the laryngeal arteries. 



1 1. The inferior laryngeal artery, a branch of the inferior thyroid. (Fig. 28.) 



1 2. The vocal cords true and false. 



13. The ventricle, the space between true and false cords. 



Thyro-arytenoideus muscle 



Attachment of erico-thyroid muscle 



ANTERIOR SURFACE OF ARYTENOID CARTILAGE 



Cut edge of eapsular ligament 

 Lateral crico-arytenoid muscle 



MUSCULAR EXTERNAL ANGLE OF ARYTENOID 

 CARTILAGE 



Lateral crico-aryteuoid muscle 

 CRICOID CARTILAGE 



FIG. 70. FRONT VIEW OF THE CRICOID AND ARYTENOID CARTILAGES. 



and Jacob.) 



(Modified from Bourgery 



14. The intrinsic muscles of the larynx. 



15. The relation of the epiglottis to the tongue. 



The thyroid cartilage (Fig. 67) has two alae united in the mid-thyroid line. 

 The result of this union gives us the pomum Adami in front, and the retiring or 

 receding angle of the thyroid cartilage behind. (Fig. 69.) The former is a 

 guide in surgical operations on the larynx and trachea ; the latter is of great im- 

 portance in learning the anatpmy and physiology of the vocal cords. Along the 



