ultrastructural changes included formation of lamellipodia with cell polarization , submembranous accumulation of microfilaments at points of plasma membrane contact with filter surfaces , densification of the membrane at these points of engagement , appearance of bundles of intermediate filaments extending into the protruded lamellipodia , and presence of oriented microtubules in the cytoplasma ( cellular cortex ) .
C0007603
plasma membrane
C0007634
cellular