By means of the karyometry method 26 zones in the basolateral group of the amygdaloid complex (AC) nuclei in rats have been studied 1 month after castration. All the main parameters characterizing distribution of the neuronal nuclei volume logs in the zones studied have been calculated. In males two regions have been revealed, in which certain reaction of the cellular neuronal nuclei to the experimentally produced deficit of sex hormones in the organism is felt. One of them is situated in the AC anterior part and includes all the nuclei of the basolateral group, the second is situated in the posterior part, occupies a rather vast area and is formed at the expense of all the nuclei of the basolateral group and adjoining structures (the dorsal endopiriform nucleus and piriform cortex). In females there is one region responding to gonadectomy, which is mainly formed at the expense of central and posterior parts of the basolateral nucleus. Basing on the lack of the structural-functional uniqueness revealed in different parts of the cortico-medial and basolateral groups of the AC nuclei, it is suggested to distinguish anterior, central and posterior parts in their composition.