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Subnuclear organization of the ophidian trigeminal motor nucleus.I. Localization of neurons and synaptic bouton distribution

Among the Reptilia the morphology of the trigeminal (V) motor nucleus is a rather good indicator of the sophistication of jaw kinetics. As it becomes more complex, the nucleus shifts ventrolaterally and becomes divisible into subnuclear groups. The cottonmouth moccasin, a pit viper with very finely developed jaw musculature and kinetics, has a very large V motor nucleus. It is divisible into three subnuclei: the ventral and intermediate, containing predominantly large neurons (40–60 μm), and the dorsal subnucleus, containing only small neurons (20 μm).