It regulates material entering or exiting the cell.Serves as anchor sites for the pore complexes of the nuclear.Can play a role in regulating gene expression.Some of the other functions of the nuclear lamina include: It consists of fine protein filaments and serves to provide mechanical reinforcement to the bilayer membrane. * Nuclear membrane pores are occupied by dense granules/fibrillar material arranged in a cylindrical manner.įibrous lamina - The fibrous lamina is part of the nuclear cytoskeleton that is attached to the inner layer of the nuclear membrane. While the lipid bi-layers are separated by a thin space between them (perinuclear cisterna), studies have shown them to be fused at the pores. Present on the nuclear membrane are nuclear pores (made up of proteins) through which substances enter or leave the cell (RNA, proteins, etc). The nuclear membrane, like the cell membrane, is a double-layered structure that consists of phospholipids (forming the lipid bilayer nucleus envelope). bacteria) that lack membrane-bound organelles.Īs with the other cell organelles of eukaryotic organisms, the nucleus is a membrane-bound organelle. Whereas eukaryotic cells have a nucleus bound membrane, this is not the case with prokaryotes (e.g. The nuclear membrane is one of the aspects that distinguish eukaryotic cells from prokaryotic cells. The shape of a nucleus, however, may also change as the cell matures. For instance, the nucleus of columnar epithelium cells appears more elongated compared to those of other cells. However, it may appear flattened, ellipsoidal or irregular depending on the type of cell. In general, the nucleus has a spherical shape as shown in most books. This section gives focus to the structure of the cell. As such, the nucleus consists of a number of structured elements that allow it to perform its functions. Structure and Organization of the NucleusĪs the organelle that contains the genetic material of a cell, the nucleus can be described as the command center.
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