The nuclear membrane that envelops the nucleus of the cell, is made of 3 main components: 

An outer membrane– The outer membrane occurs as a lipid bilayer, which is continuous with the endoplasmic reticulum and covered with ribosomes.

An inner membrane– The inner membrane contains proteins that chain the genetic material in position. 

Nuclear pores– The nuclear pores are made up of large complex proteins that link the inner and outer nuclear membranes and permit only select molecules to pass through. Each nuclear pore is made up of thirty distinct proteins.