The structure of the cell nucleus includes nuclear membrane, chromatin, nucleolus, nuclear matrix and other substances. 1. Nuclear membrane: wrapped in the surface of the nucleus, it is the boundary membrane separating the nucleus from the cytoplasm, the channel for the exchange of substances between the nucleus and the cytoplasm, and also plays the role of protecting the nucleus. 2. Chromatin: composed of DNA and protein, which contains the genetic material of the organism, it can also be converted into chromosomes during the division phase, chromosomes and chromatin are different manifestations of the same material in the nucleus in different phases of the cell cycle. 3. Nucleolus: a structure appearing in the nucleus of eukaryotic cells in the interphase, showing periodic disappearance and reconstruction in the cell division phase, the shape, size and number of nucleolus vary according to the species of organisms, the morphology of the cell and physiological morphology, the nucleolus is mainly a place for the synthesis and processing of rRNA and the assembly of ribosomal subunits. 4. The nuclear matrix is a component of the nucleus other than chromatin and nucleolus, including the nuclear fluid and the nuclear skeleton. Cell structure is an important component of the human body, if you feel unwell, it is recommended to standardize the diagnosis and treatment under the guidance of regular medical institutions and professional doctors.