152 



THE DISSECTION OF PIG EMBRYOS 



In later stages (Fig. 156 A and B) the lateral mandibular anlages, 

 bounded laterally by the alveolo-lingual grooves, increase rapidly in size 



Branchial arch I 

 Tuberculum impar 



Branchial arch 2 



Branchial arch 3 

 Branchial arch 4 : 



Arytenoid ridge 



Lateral lingual anlage 



Branchial arch I 

 Lateral lingual anlage 



Branchial arch 3 - 

 Branchial arch 4 



Arytenoid ridge 



Tiiberculum impar 



Branchial arch 2 



Epiglottis 

 Glottis 



B 



FIG. 156. Dissections showing the development of the tongue in pig embryos. X 12. A, 



9 mm. embryo; B, 13 mm. embryo. 



and fuse with the tuberculum impar, which lags behind in development, 

 and, according to Hammar atrophies completely. The epiglottis becomes 



Lateral tongue swellings Thyreoid diverticulum Lateral tongue swellings 



Entrance to 

 larynx 



Entrance to 



larynx 

 , Arytenoid 

 spellings 



FIG. 157. The development of the tongue in human embryos. .4,5mm.; B, 7 mm. (modified 



from Peters). 



larger and concave on its ventral surface. Caudal to it, and in early 

 stages continuous with it, are two thick rounded folds, the arytenoid ridges. 

 Between these is the slit-like glottis leading into the larynx (see p. 167). 



