Nuclear membrane

 The nuclear membrane (also known as the nuclear enveleope) is a double lipid bilayer that encloses the nucleus, separating the genetic information from the cytosol. The space between the two membranes is known as the perinuclear space and is between 20-100nm wide. 

Nuclear pores exist within the nuclear membrane in order regulate the exchange of large molcules such as proteins between the nucleus and cytoplasm. A network of filaments formed by the nuclear lamina is attached to the inner membrane, these filaments play vital roles in both mitosis ans meiosis.