Cytoarchitecture and planimetry of structures of amygdaloid body posterior region were investigated in view of A.A. Zavarzin concepts on nuclear and screen-type centres of nervous system. Amygdaloid body was shown to be a complicated heterogeneous brain formation, the structure of which reflects both basic principles (nuclear and screen-type) of grey substance organization. Structural and quantitative characteristics of the amygdaloid body posterior region provides a confirmation for assumption that it is a nucleo-paleocortical brain component.