86 THE MEMBRANOUS LABYRINTH, BY PROF. RUDINGER. 



recognizable in the embryo.* Sections made through the 

 temporal bone at various stages of development show that 

 the cavity of the vestibule arid of the semicircular canals 

 is filled with a gelatinous substance, which becomes con- 

 Fig. 296. 



Fig. 296. Membranous labyrinths of various vertebrate animals. 

 A, from Man ; B, from the Calf ; C, from the Pike ; D, from Vultur 

 fulvus ; E, from Rana esculenta. 1, Canalis semicircularis horizon- 

 tails ; 2, can. sem. superior; 3, can. sem. posterior; 4, canalis com- 

 munis ; 5, ampulla-form termination of the can. sem. horizontalis ; 

 6, utriculus ; 7, sacculus rotundus. 



densed near the cartilaginous wall, and that the parts of the 

 labyrinth are connected with this somewhat denser fibrous 

 layer. The vessels that develop in this part traverse the 



* Kolliker first gave an illustration of the relations of the semicircular 

 canals in the foetus, in his Eiitwickhnufsyescliichte, or History of Development. 



