Structure and topography of the cochlear nucleus in bison

Investigations were performed in 3 bisons of Białowieza herd. Brain stems were fixed in 10% formaldehyde and cut transversely in sections of 15 microns. Sections were stained with hematoxylin and luxol fast blue. The cochlear nucleus in bison is divided into ventral and dorsal cellular bands. The ventral nucleus is longer and it is subdivided into dorsal and ventral parts. It is formed by round and multipolar cells. The dorsal cochlear nucleus shows laminar structure. Within the nucleus the ependymal, molecular and polymorphic zones may be distinguished. The cells are round, fusiform and multipolar.