Transition areas of amygdala

The transition areas of amygdala are regions of grey matter around the main amygdaloid nuclear complex where the amygdaloid tissue gradually merges with neighbouring cortical and limbic structures. Unlike the basolateral, centromedial and cortical nuclear groups, these areas do not have sharply defined boundaries and are therefore better understood as zones of anatomical transition rather than separate, well-defined nuclei. In other words, these areas can be viewed as interfaces between the amygdaloid nuclear complex and adjacent cortical/limbic regions, rather than as distinct nuclei with clearly defined borders.

An important example is the amygdalo-piriform area, which consists of grey matter situated between the amygdaloid body and the piriform cortex (Weiss et al, 2021).