https://www.selleckchem.com/pr....oducts/bsj-4-116.htm
Primary sensory neurons are usually situated in ganglia outside the brain, while the mesencephalic nucleus of the trigeminal nerve (Me5) is situated inside the brain. However, it remains unknown why only Me5 situated inside the brain is. The neurons of Me5 are the cell bodies of primary afferent fibers concerned with the muscles of mastication and periodontal receptors of both maxillary and mandibular teeth. Interestingly, there was no Me5 till the evolution level of the agnatha, vertebrates which lack jaws, while Me5 appeared with th
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