SENSE OF HEARING. 



611 



the auditory nerve, which terminate, as already described, in a 

 macula acustica in which are otoliths, and it gives off a small 

 canal which, uniting with that coming from the utricle, forms the 



FIG. 390. Nerve terminations in macula ; Golgi method (G. Eetzius). 



ductus endolymphaticus. On the opposite side is a similar canal, 

 1 mm. long and 0.5 mm. wide, the canalis reuniens (Fig. 391), by 



9 



FIG. 391. Diagram of right membranous labyrinth seen from the external side : 

 1, utricle ; 2, 3, 4, superior, posterior, and horizontal semicircular canals; 5, saccule; 

 6, ductus endolymphaticus, with 7, 7', its twigs of origin ; 8, saccus endolymphaticus ; 



9, canalis cochlearis, with 9', its vestibular cul-de-sac, and 9", its blind extremity; 



10, canalis reuniens (after Testut). 



which it is in communication with the scala media or canalis 

 cochlearis. 



Ductus Endolymphaticus. This canal, formed by the union of 

 the canals from the utricle and saccule, is lodged in the aquseductus 



