The transparent, semi-permeable and flexible membrane around the nucleus is said to be the nuclear membrane.
Structure: It is a porous and two-layered membrane. It is made of lipoprotein. It disappears during the cell division.
i) This membrane separates the nucleoplasm from the cytoplasm and gives nucleus a particular shape.
ii) It regulates the movement of different substances in between cytoplasm and nucleus.
iii) It helps in conducting different substances synthesized in the nucleus to the cytoplasm.
iv) It keeps the nucleus attached to the endoplasmic reticulum.
v) It protects the nucleus