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Nucleus
Found in all cells except Red Blood Cells
Archive of the cell; source of our ribosomal, messenger, and transfer RNA; Performs synthetic and metabolic functions
Functions of the nucleus
Vesicular, Segmented, Anucleated, Multi-nucleated, Multi-lobulated, Chromatic, Pyknotic
Types of nuclei
Vesicular
Type of this nucleus means that there are intense metabolic activities in the cell
Euchromatin
Vesicular nuclei contain this form of chromatin
2 Segments
Eosinophils have this many segments in their nucleus
3-5
White blood cells have this many segments in their nucleus
Multinucleated
Type of cell with multiple peripheral nuclei
Skeletal Muscle Cells
Cells that are multinucleated and the nuclei are scattered and located peripherally
Osteoclasts
Cells that are multinucleated but the nuclei are clustered together
Multi-lobulated nucleus
Single-nucleus but has many lobes
Megakaryocytes
Example of multi-lobulated nucleus
Chromatic Nucleus
Dark Staining nucleus
Pyknotic Nucleus
VERY dark staining nucleus
Cells that are dying
Cells that pyknotic nuclei are present
Nuclear Membrane
Separates the nucleus from the cytoplasm
35 nm
Thickness of the nuclear membrane
Nuclear Chromatin
Contains DNA and Proteins
Heterochromatin and euchromatin
2 types of chromatin
Heterochromatin
Dark-staining chromatin; metabolically inert
Euchromatin
Pale-staining Chromatin; Metabolically active
Nucleolus
Site of synthesis of ribosomal RNA and ribosomal assembly
Dense Fibrillar Components, Paler Fibrillar Centres, Granular Component
3 regions of the Nucleolus
Dense fibrillar components
Region of the nucleolus for the site of ribosomal RNA synthesis
Granular Component
Region of the nucleolus for ribosomal assembly
Chromosomes
May show irregular densities of staining along their lengths
Barr Bodies
Small visible mass in the inner portion of a nuclear membrane in females