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 

 Tubercul 



rial arch i IMP JB9J 



um impar ^E^H 



Branchial arch 2 



Branchial arch 3 

 Branchial arch 4 



Arytenoid ridge s \ xJL-^ 



Lateral lingual anlage 



Branchial arch i 

 Lateral lingual anlage 



Branchial arch 3 



Branchial arch 4 



Arytenoid ridge 



Tuberculum impar 



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 Thvreoid diverticulum Lateral tongue swellings 



A B 



FIG. 157. The development of the tongue in human embryos. A, 5 mm.; 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). 



