Long Answer Questions
With the help of a suitable diagram describe the structure of a neuron.
With the help of a suitable diagram describe the structure of a neuron.
The tissue of the nervous system consists of two types of cells, those are the Nerve cells and Glial cell. The nerve cells are called Neuron and the glial cells are called neuralgia. Among these, the neurons performed the function of the nervous system by transmitting information from one part of the body to another and the glial cells are supporting elements.
The Neurons are the structural and functional units of the nervous system.
A typical structure of neuron consists of a cell body and two processes, those are Dendron and Axon. The cell body of a neuron is like other cells of the body, consisting of a nucleus and cytoplasm covered by a plasma membrane. The cytoplasm contains various organelles and inclusions. In adult nerve cells, the centrosome is absent or inactive so their division does not occur. Specialized cytoplasmic organelles called Nissl granules or Nissl body made up of ribonucleoprotein are found in the cell body except in the axon hillock region from where the axon arises. These granules are also present in dendrons but absent in axon.
In general, a neuron has many dendrons. However, in some neurons, the Dendron may be only single or may be absent in case. The single long efferent process of a neuron is called axon which carries impulses away from the cell body to the next neuron or the target organ, such as muscle or gland.
Axons are usually unbranched. However, they give a few small terminal branches called telodendria having swollen ends known as terminal buttons. An axon is also called nerve fiber. A neuron possesses only one axon and the variable number of dendrons. If there is only one process, it is usually the axon. In such type of neurons, the cell body receives stimulation. In some specialized neurons, the axon may be absent, such as adrenal medullary cells and amacrine cells of a retina of an eye.
The tissue of the nervous system consists of two types of cells, those are the Nerve cells and Glial cell. The nerve cells are called Neuron and the glial cells are called neuralgia. Among these, the neurons performed the function of the nervous system by transmitting information from one part of the body to another and the glial cells are supporting elements.
The Neurons are the structural and functional units of the nervous system.
A typical structure of neuron consists of a cell body and two processes, those are Dendron and Axon. The cell body of a neuron is like other cells of the body, consisting of a nucleus and cytoplasm covered by a plasma membrane. The cytoplasm contains various organelles and inclusions. In adult nerve cells, the centrosome is absent or inactive so their division does not occur. Specialized cytoplasmic organelles called Nissl granules or Nissl body made up of ribonucleoprotein are found in the cell body except in the axon hillock region from where the axon arises. These granules are also present in dendrons but absent in axon.
In general, a neuron has many dendrons. However, in some neurons, the Dendron may be only single or may be absent in case. The single long efferent process of a neuron is called axon which carries impulses away from the cell body to the next neuron or the target organ, such as muscle or gland.
Axons are usually unbranched. However, they give a few small terminal branches called telodendria having swollen ends known as terminal buttons. An axon is also called nerve fiber. A neuron possesses only one axon and the variable number of dendrons. If there is only one process, it is usually the axon. In such type of neurons, the cell body receives stimulation. In some specialized neurons, the axon may be absent, such as adrenal medullary cells and amacrine cells of a retina of an eye.
