The article aims at presenting a few neuroanatomical models and neuroanatomically based theories (the Maturational State Hypothesis, the Aging Hypothesis, the Fragile Rote Hypothesis and the Entrenchment Hypothesis, among other things,) inherent in the concept of fossilization. The models will be considered from the point of view of the advanced users of language, an emphasis being put on an interplay of factors responsible for the fossilized language competence.