IN A PRECEDING article,1 the existence of two systems of fibers, independent of each other, in the lamina spiralis of the cochlea of mammals was clearly demonstrated. Of these two systems, one is radially arranged and has its origin in the cells of the spiral ganglion, while the other is spirally arranged and is independent of the spiral ganglion. The origin and destination of the spiral fibers appear to be uncertain2; however, I am of the opinion that some, if not all of them, represent the peripheral fibers of the vestibular cells contained in a modiolar expansion of the vestibular ganglion, formerly described by Boettcher3 as an independent ganglion and clearly recognizable in my preparations. The vestibulocochlear anastomosis described by Oort partially consists of these fibers from the modiolar ganglion joining the cochlear nerve.
The spiral fibers, or at least part of them, should then be considered
ETTORE BOCCA. NOTES ON THE INNERVATION OF THE COCHLEA. II. AMA Arch Otolaryngol. 1953;58(6):690–703. doi:10.1001/archotol.1953.00710040717005