DISSECTION OF THE HEAD AND NECK 



309 



side, due to the cuneiform and the corniculate cartilage respec- 

 tively; between the tubercula corniculata of the two sides, that 

 is, in the median plane behind, note the interarytaenoid notch 

 (incisura inter arytaenoidea). The cavity between the aditus 

 and the ventricular folds (plicae ventriculares) (0. T. false vocal 

 cords) is called the vestibule of the larynx (vestibulum laryngis). 

 This cavity communicates, by means of the slit (rima vestibuli) 

 (0. T. false glottis) between the ventricular folds (plicae ven- 

 triculares) (0. T. false vocal cords), with the superior entrance 

 to the glottis (aditus gtottidis superior). 



FIG. 135. 



Cavum pharyngis 

 Recessus piriformis^ 



Plica ventricularis 



Ventriculus laryngis- 



Glottis'"' 



M. arytnriioiilriis trnnsvcrsus 

 -M. arytaonoidcus ohliquus 



-Rima vestibuli 



Ventriculus laryngis (Morgagnii) 



- Appendix ventriculi laryngis 

 Tuberculum epiglotticum 



Macula flava 

 Plica vocalis > 



M. thyreoarytaenoideus (externus) 



Pars intennembranacea 



rimae glottidis 

 M. vocalis 



.Pars interoartOacinea 



rimae glottidis 



Cartilago arytaenoidea 

 (processus vocalis) 



Both sections of a larynx cut transversely across in the region of the ventricle. The mucous 

 membrane has been removed from the right side of the lower section. (After Toldt, Anat. Atlas, Wien, 

 1900, 2 Aufl., p. 445, Fig. 757.) 



On each side of the aditus glottidis superior is situated the 

 ventricle of the larynx (ventriculus laryngis [Morgagnii}) (O. 

 T. laryngeal sinus), with its blind sac-like appendage, appendix 

 ventriculi laryngis (O. T. laryngeal pouch or sac). 



The true vocal cord, or vocal fold (plica vocalis) on each side, 

 is the free margin of the three-sided prismatic projection known 

 as the vocal lip (labium vocale). Note that the plica vocalis is 

 situated farther medialward than the plica ventricularis. Ob- 

 serve near the anterior extremity of the plica vocalis the " yel- 

 low spot" (macula flava). To what is this due? 



