Neurons
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_The neuron is the basic unit in the nervous system. It is a specialized
conductor cell that receives and transmits electrochemical nerve
impulses.
There are four types of neurons: sensory, motor, and inter-neurons.
A typical neuron has a cell body and long arms that conduct impulses from one body part to another body part.
There are three different parts of the neuron:
Cell Body: The cell body is like any other cell with a nucleus or control center.
Dendrites: A short branched extension of a nerve cell, along which impulses received from other cells at synapses are transmitted to the cell body.
Axon: An axon is a long, thin part of the nerve cell that carries impulses away from the cell body to another neuron or tissue. There is usually only one axon per neuron.
Myelin Sheath: The neuron is covered with the Myelin Sheath These are white segmented covering and insulating the axons and dendrites. It also prevents the loss of charged ions from the nerve cells.
The neurilemma is the layer of Schwann cells with a nucleus. Its function is to allow damaged nerves to regenerate. Nerves in the brain and spinal cord do not have a neurilemma and, therefore cannot recover when damaged.
There are four types of neurons: sensory, motor, and inter-neurons.
A typical neuron has a cell body and long arms that conduct impulses from one body part to another body part.
There are three different parts of the neuron:
- the cell body
- dendrites
- axon
Cell Body: The cell body is like any other cell with a nucleus or control center.
Dendrites: A short branched extension of a nerve cell, along which impulses received from other cells at synapses are transmitted to the cell body.
Axon: An axon is a long, thin part of the nerve cell that carries impulses away from the cell body to another neuron or tissue. There is usually only one axon per neuron.
Myelin Sheath: The neuron is covered with the Myelin Sheath These are white segmented covering and insulating the axons and dendrites. It also prevents the loss of charged ions from the nerve cells.
The neurilemma is the layer of Schwann cells with a nucleus. Its function is to allow damaged nerves to regenerate. Nerves in the brain and spinal cord do not have a neurilemma and, therefore cannot recover when damaged.