<Tr> <Th> FMA </Th> <Td> 63888 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terminology (edit on Wikidata) </Td> </Tr> <P> A nuclear membrane, also known as the nuclear envelope, is the lipid bilayer membrane which surrounds the genetic material and nucleolus in eukaryotic cells . </P> <P> The nuclear membrane consists of two lipid bilayers--the inner nuclear membrane, and the outer nuclear membrane . The space between the membranes is called the perinuclear space, a region contiguous with the lumen (inside) of the endoplasmic reticulum . It is usually about 20--40 nm wide . The nuclear membrane also has many small holes called nuclear pores that allow material to move in and out of the nucleus . </P>

Where is the nuclear envelope located in a cell