Nucleolus

These neurons contain a euchromatic nucleus with a well-defined nucleolus. The nucleolus is the site of ribosomal RNA transcription and the initial assembly of ribosomes. Nuclei generally have one nucleolus; however, multiple nucleoli are common in highly active cells, such as liver cells.  1000x

These neurons contain a euchromatic nucleus with a well-defined nucleolus. The nucleolus is the site of ribosomal RNA transcription and the initial assembly of ribosomes. Nuclei generally have one nucleolus; however, multiple nucleoli are common in highly active cells, such as liver cells.  1000x

Nissl substance is a unique aggregation of rough endoplasmic reticulum and polysomes in neurons.

Image was taken of a slide from the Virtual Microscopy Laboratory (http://www.histologyguide.com)