Abstract
The histochemical demonstration of acetylcholinesterase (AChE) activity was observed to be well localized in the efferent nerve fibers in the inner ear. The distribution of AChE activity in the nerve fibers of cat and squirrel monkey were reported. The vestibular efferent fibers showed a similar course to that reported elsewhere, although AChE-active fibers were sparsely distributed in the vestibular nerve. These fibers did not apparently belong to the well-known efferent nerve fibers in the inner ear. The author em-phasized the necessity of the vital perfusion-prefixation and decalcification of the experi-mental animals, in order to obtain good preservation of the specimens and well-localized AChE activity.
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