MIDDLE-EAR REGION OP GALLUS 



245 



the plane of the carotid canal and lie in the lateral tubal wall. 

 The tube becomes rapidly smaller as it proceeds medially, and 

 when the tube fuses with its fellow to form the common duct 

 already mentioned, the right and left elastic strands also fuse to 



TA 



.^-^ 



■4 



V* I 



>-. 



"^. 



TA 



DLT 





SDTL 



DTL 



10 



form the floor of the common opening in the occipitosphenoidal 

 suture. Here the amount of elastic tissue is increased by fusion 

 with the stout elastic pharyngeal membrane which is projected 

 upward into the tubal recess between the palatal muscles. This 

 may be followed upward from the recess in figures 5 to 10, inclu- 

 sive. It may be interesting to note that in certain birds (goose, 



