io6 



PRACTICAL AX A TO MY. 



THE LARYNX. 



The upper part of the respiratory tract is called the larynx. Its downward 

 continuation into the neck and thorax is the trachea. The essential organ of 

 voice is a vocal cord on each side of a chink called the rima glottidis. The 

 greater part of the larynx is set aside as a protective for the delicate vocal cords. 



BODr OF HYOIO BONE 

 Thyro-hyoid ligament 



Cartilage triticea 

 Foramen for superior 



laryngeal nerve 

 Median portion of thyro- 



hyoid membrane 



SUPERIOR CORNU OF THYROID 



CARTILAGE 



MEDIAN NOTCH OF THYROID 

 CARTILAGE 



Pomum Adami 



OBLIQUE LINE OF THYROID 

 CARTILAGE 



Crico-thyroid membrane _ 



INFERIOR CORNU OF THYROID 

 CARTILAGE 



THIRD RING OF TRACHEA 



OBLIQUE LINE BELOW SUPERIOR 



TUBERCLE 

 WING OF CARTILAGE BEHIND 



OBLIQUE LINE 



OBLIQUE LINE ABOVE INFERIOR 

 TUBERCLE 



ANTERIOR BORDER OF INFERIOR 

 CORNU 



FIG. 67. FRONT VIEW OF THE CARTILAGES OK THE LARYNX. (Modified from Hourgery and Jacob.) 



POSTERIOR SURFACE OF ARYTENOID 



MUSCULAR EXTERNAL ANQLE 

 Crioo-ary tenoid j oint 



MEDIAN RIDGE 



POSTERIOR SURFACE OF CRICOID 

 CARTILAGE 



Longitudinal fibres of oesophagus 



CORNICULUM LARYNCIS 

 Arytenoideua muscle 



Crico-arytenoideus poBticuB muscle 

 Crioo-arytenoideus posticus muscle 



ARTICULAR SURFACE FOR INFERIOR CORNU 

 OF THYROID CARTILAGE 



FIG. 68. BACK VIEW or THE CRICOID AND ARYTENOID CARTILAGES. (Modified from liourgery 



and Jacob.) 



A minor part of the larynx is set aside to move the vocal cords. To gain a 

 comprehensive idea of the larynx in your dissection, you must find on your 

 dissection the following structures : 



1. The thyroid cartilage and hyoid bone. (Fig. 67.) 



2. The thyro-hyoid membrane and median notch of thyroid cartilage. 



