The synaptology of the primary afferent vestibulocochlear fibers of the frog's nucleus vestibularis lateralis (NVL), Nucleus cochlearis dorsalis (NCD) and nucleus saccularis (NS) was studied with the aid of cobalt labeling technique. 
We have also demonstrated a more extensive network of calcitonin gene-related peptide-like immunoreactive fibers distributed in various areas throughout the rat brain than has been reported previously such as the colliculus inferior, nucleus olivaris superior, nucleus vestibularis lateralis and inferioris, and Nucleus cochlearis dorsalis and ventralis, etc..
Dense populations of cell somata were present in many major areas including neocortex, piriform cortex, hippocampus, amygdaloid complex, nucleus caudatus, nucleus accumbens, anterior periventricular hypothalamic area, ventromedial hypothalamic nucleus, nucleus arcuatus, medial to and within the lateral lemniscus, pontine reticular nuclei, Nucleus cochlearis dorsalis and immediately dorsal to the nucleus tractus solitarii.
The nucleus vestibularis medialis, nucleus vestibularis lateralis and Nucleus cochlearis dorsalis exhibit activity of high order, which indicates that the auditory system in the animal is quite active.
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