The nuclear envelope is composed of the nuclear lamina, the nuclear pore complexes, and the nuclear membranes.
The nuclear lamina is a discontinuous structure that occupies only a fraction of the nuclear periphery, and at some points, the inner nuclear membrane may interact directly with the chromatin.
The nuclear membranes can be divided into 3 morphologically distinct but interconnected domains: the outer nuclear membrane, the inner nuclear membrane, and the nuclear pore membrane.