Postnatal Development of the Structure of the Peripheral Vestibular System of the Gerbil

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Postnatal development of the peripheral vestibular system and surrounding components in the gerbil was studied to obtain topological information for electrical vestibular stimulation. At postnatal day 1, the peripheral vestibular nerve had already reached the vestibular apparatus. The centralvestibular nerve extended posteriorly to enter the brainstem at a sharp angle toanterior-posterior axis. During development, the vestibular ganglion was progressively displaced caudally, along with the vestibular nerve and the ventrally located facial nerve. increasing the angle to theanterior-posterior axis to nearly 90°by postnatal day 30. Contact between the anterior part of the vestibular ganglion and the facial nerve, and that between the posterior part of the ganglion and thecochlear nerve were observed at all ages.These regions were considered unsuitablefor electrical stimulation because of the highrisk of stimulating the facial or cochlear nerve, similar to those regions in the adult.These results as well as the observation thatthe diameter of the lateral semicircular canalremained nearly constant showed that the technique we used for electrical vestibular stimulation in adult animals was apparently a good choice in younger animals as well.
日本組織細胞化学会の論文