138 THE AUDITORY NERVE AND COCHLEA, BY W. WALDEYER, 



Fig. 321. Vertical section of the first turn of the cochlea, from a child 

 of a year and a half old, magnified 100 diameters. The position of the 

 membrana tectoria is given from other preparations of the same coch- 

 lea. SV, Scala vestibuli ; ST, scala tympani ; DC, ductus cochlearis ; 

 L sp 01, vestibular, L sp o 2 , tympanal lamella of the lamina spiralis 

 ossea ; N t cochlear nerve ; aa, bony wall of the cochlea ; 66, perios- 

 teum ; ee, cushion of connective tissue (ligamentumspirale of Kolliker), 

 partly detached from the bony wall, and condensed near the ductus 

 cochlearis to form a special fibrous wall to this canal ; St v, stria 

 vascularis ; d, point at which the periosteum and the connective-tissue 



