Nissl's granules are present in
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Answer:
- Nissl's granules are the granular structure that is present in the neurons.
- Nissl bodies are nodal points in the endoplasmic reticulum, which permeate the cell body and dendrites.
- The function of nissl granules includes the manufacture and release of proteins and amino acids.
- It is localized in the cyton and dendron and visualized by the Nissl staining method which has an affinity for basic dyes. Nissl granules are present in the cytoplasm of the cell body of the neurons along with other cell organelles like the Golgi apparatus, endoplasmic reticulum, mitochondria, nucleus. These granules give a slight color appearance to the cytoplasm of the cell body.
- The proteins produced by it are used for inter-cellular mechanisms.
- An axon is the tubular process of the nerve cell, that carries impulses away from the cell body. It arises from the cyton at the axon hillock. It has only neurofibrils. Here Nissl's granules are absent.
- Axon cannot synthesize its protein hence it depends on soma.
- The hillock is a region where materials are committed to the axon (cytoskeletal elements, mitochondria) or are excluded from the axon (RER).
- The quantity of Nissl material in the cell is roughly proportional to the size of the cell, but both this and the arrangement of the granules vary in different states of physiological activity.
- The Soma also called a cell body of a neuron contains the nucleus and other structures common to living cells.
- Small nerve cells of the central nervous system sometimes contain no Nissl bodies.
- So, Nissl granules are absent in the axon.
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