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Nucleolus

This electron micrograph shows the subdivisions of the nucleolus. The palest region, the fibrillar center, contains the nucleolar organizing regions of multiple chromosomes; the pars fibrosa (dense fibrillar component) contains the newly transcribed ribosomal RNA (rRNA); and the pars granulosa containing maturing ribosomes. This nucleolus is partially surrounded by perinucleolar heterochromatin.  35,000x

Nucleolus <p>This electron micrograph shows the subdivisions of the nucleolus. The palest region, the fibrillar center, contains the nucleolar organizing regions of multiple chromosomes; the pars fibrosa (dense fibrillar component) contains the newly transcribed ribosomal RNA (rRNA); and the pars granulosa containing maturing ribosomes. This nucleolus is partially surrounded by perinucleolar heterochromatin.  35,000x</p>

Nucleolus

This electron micrograph shows the subdivisions of the nucleolus. The palest region, the fibrillar center, contains the nucleolar organizing regions of multiple chromosomes; the pars fibrosa (dense fibrillar component) contains the newly transcribed ribosomal RNA (rRNA); and the pars granulosa containing maturing ribosomes. This nucleolus is partially surrounded by perinucleolar heterochromatin.  35,000x
- Nucleolar organizing center (fibrillar center) <p>This electron micrograph shows the subdivisions of the nucleolus. The palest region, the fibrillar center, contains the nucleolar organizing regions of multiple chromosomes; the pars fibrosa (dense fibrillar component) contains the newly transcribed ribosomal RNA (rRNA); and the pars granulosa containing maturing ribosomes. This nucleolus is partially surrounded by perinucleolar heterochromatin.  35,000x</p>

- Nucleolar organizing center (fibrillar center)

This electron micrograph shows the subdivisions of the nucleolus. The palest region, the fibrillar center, contains the nucleolar organizing regions of multiple chromosomes; the pars fibrosa (dense fibrillar component) contains the newly transcribed ribosomal RNA (rRNA); and the pars granulosa containing maturing ribosomes. This nucleolus is partially surrounded by perinucleolar heterochromatin.  35,000x
- Pars fibrosa <p>This electron micrograph shows the subdivisions of the nucleolus. The palest region, the fibrillar center, contains the nucleolar organizing regions of multiple chromosomes; the pars fibrosa (dense fibrillar component) contains the newly transcribed ribosomal RNA (rRNA); and the pars granulosa containing maturing ribosomes. This nucleolus is partially surrounded by perinucleolar heterochromatin.  35,000x</p>

- Pars fibrosa

This electron micrograph shows the subdivisions of the nucleolus. The palest region, the fibrillar center, contains the nucleolar organizing regions of multiple chromosomes; the pars fibrosa (dense fibrillar component) contains the newly transcribed ribosomal RNA (rRNA); and the pars granulosa containing maturing ribosomes. This nucleolus is partially surrounded by perinucleolar heterochromatin.  35,000x
- Pars granulosa <p>This electron micrograph shows the subdivisions of the nucleolus. The palest region, the fibrillar center, contains the nucleolar organizing regions of multiple chromosomes; the pars fibrosa (dense fibrillar component) contains the newly transcribed ribosomal RNA (rRNA); and the pars granulosa containing maturing ribosomes. This nucleolus is partially surrounded by perinucleolar heterochromatin.  35,000x</p>

- Pars granulosa

This electron micrograph shows the subdivisions of the nucleolus. The palest region, the fibrillar center, contains the nucleolar organizing regions of multiple chromosomes; the pars fibrosa (dense fibrillar component) contains the newly transcribed ribosomal RNA (rRNA); and the pars granulosa containing maturing ribosomes. This nucleolus is partially surrounded by perinucleolar heterochromatin.  35,000x
Perinucleolar heterochromatin <p>This electron micrograph shows the subdivisions of the nucleolus. The palest region, the fibrillar center, contains the nucleolar organizing regions of multiple chromosomes; the pars fibrosa (dense fibrillar component) contains the newly transcribed ribosomal RNA (rRNA); and the pars granulosa containing maturing ribosomes. This nucleolus is partially surrounded by perinucleolar heterochromatin.  35,000x</p>

Perinucleolar heterochromatin

This electron micrograph shows the subdivisions of the nucleolus. The palest region, the fibrillar center, contains the nucleolar organizing regions of multiple chromosomes; the pars fibrosa (dense fibrillar component) contains the newly transcribed ribosomal RNA (rRNA); and the pars granulosa containing maturing ribosomes. This nucleolus is partially surrounded by perinucleolar heterochromatin.  35,000x
Nuclear envelope <p>This electron micrograph shows the subdivisions of the nucleolus. The palest region, the fibrillar center, contains the nucleolar organizing regions of multiple chromosomes; the pars fibrosa (dense fibrillar component) contains the newly transcribed ribosomal RNA (rRNA); and the pars granulosa containing maturing ribosomes. This nucleolus is partially surrounded by perinucleolar heterochromatin.  35,000x</p>

Nuclear envelope

This electron micrograph shows the subdivisions of the nucleolus. The palest region, the fibrillar center, contains the nucleolar organizing regions of multiple chromosomes; the pars fibrosa (dense fibrillar component) contains the newly transcribed ribosomal RNA (rRNA); and the pars granulosa containing maturing ribosomes. This nucleolus is partially surrounded by perinucleolar heterochromatin.  35,000x
Main SlideNucleolus - Nucleolar organizing center (fibrillar center) - Pars fibrosa - Pars granulosaPerinucleolar heterochromatinNuclear envelope