วิกิพีเดีย
A nuclear membrane, also known as the nuclear envelope, nucleolemma orkaryotheca, is the double lipid bilayer membrane which surrounds the genetic material andnucleolus in eukaryotic cells.
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 has many small holes called nuclear pores that allow material to move in and out of the nucleus.