Answer: (1)
Nissl’s Granules are the substances found in the neurons which are a large granular type of body. These granules are very useful for protein synthesis also help to transport these proteins to the part known as cyton.
What are Nissl bodies composed of?
Subcellular structures found in nerve cell bodies and DENDRITES. They consist of granular endoplasmic reticulum (ENDOPLASMIC RETICULUM, ROUGH) and RIBOSOMES.
What is Nissl granules consist of?
Solution : Nissl’s granules (or Nissl’s bodies) are the groups of ribosomes and rough endoplasmic reticulum.
Where are Nissl’s granules found?
Nissl’s granules are present in the cytoplasm of the cell body of the neurons along with other cell organelles like Golgi apparatus, endoplasmic reticulum, mitochondria, nucleus, etc. These granules give a slight coloured appearance to the cytoplasm of the cell body. They help in protein synthesis in the neurons.
How does the nissl substance appear and what is it in reality?
Under the light microscope, nissl substances range in appearance from rhomboid blocks in large neurons to particulate materials in the cell bodies of smaller neurons. Nissl bodies are nodal points in the endoplasmic reticulum, which permeate the cell body and dendrites.
What is a nissl body in a neuron?
Nissl bodies, also called nissl substance, are granules in the cytoplasm of nerve cell bodies that are strongly stained by basic dyes and appear as basophilic clumps on light microscopy. They consist of aggregates of free polyribosomes and rough endoplasmic reticulum.
What is contained in gray matter?
Grey matter consists of neuronal cell bodies (known as soma), which are circular structures that house the nucleus of the cells. In the cerebrum, estimated cell numbers vary from 10 billion to more than 50 billion neurons.
What is soma in neuron?
The region of the neuron containing the nucleus is known as the cell body, soma, or perikaryon (Figure 8.2). The cell body is the metabolic center of the neuron.
Why Nissl granules are absent in axon?
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).
Is Nissl granules found in axon?
Explanation: Nissl granules are absent in Axon. The neuron is made up of a cell body (cyton), dendrites (dendron), axons and axon terminals. Nissl granules are discrete structures, which consist rough endoplasmic reticulum and free ribosomes.
What are Nestle bodies?
Nissl body is also called as nissl substance. It is a large granular body present in neurons. Their main function is to synthesize and release proteins that are important for neuronal growth and regeneration of axons. It is made up of rough endoplasmic reticulum (RER) and free ribosomes.
What do Nissl granules represent under the electron microscope?
One of the characteristic features of neuronal morphology under the electron microscope is the Nissl substance which represents granular ribonucleoprotein particles attached to the endoplasmic reticulum.
