The tissue sample contains two fractured membranes (outer and inner) that form the nuclear envelope of a pancreatic exocrine cell. The specimen fracture has exposed the Е face of the outer membrane, i.e. a surface contacting the perinuclear space. It has relatively few intramembrane particles, whereas the nuclear pores #1, #2, #3 look like pits with a slightly elevated bottom. Some globular particles of the bottom belong to the nuclear pore complex.

Another surface seems to be situated a little deeper. It belongs to the inner nuclear membrane layer that is contacting the nuclear compartment. This is a Р face, which contains much more intramembrane particles, while the nuclear pores appear as regular cylindrical projections or pits with a flat bottom.