Nissls granules are characteristic of all neurons. These are larger and irregular masses of ribosomes and rough endoplasmic reticulum. These are the site of protein synthesis and are thought to be part of a maintenance system which, monitors the state of the cell. The cyton is a process arise in neuron. It contains abundant cytoplasm (neuroplasm), large and central nucleus, mitochondria, Golgi body, rough endoplasmic reticulum, ribosomes, fat globules etc.