Summary
In mouse, rat and hamster there occurs in the nasal mucosa and far forward in the nose a somewhat diffuse ganglion of placodal origin. It persists throughout life. The identity of the associated nerve has not yet been established, but N. terminalis and N. ethmoidalis anterior may both be involved. Comparable structures seem to be present in some mammals, but not in others. The function of the ganglion is unknown.
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Grüneberg, H. A ganglion probably belonging to the N. terminalis system in the nasal mucosa of the mouse. Z. Anat. Entwickl. Gesch. 140, 39–52 (1973). https://doi.org/10.1007/BF00520716
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DOI: https://doi.org/10.1007/BF00520716