Notes, Exercises, Videos, Tests and Things to Remember on Introduction to Nervous System
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The system that receives and transmits the stimulus, to and from the brain is called the nervous system.
The cell that transmits the message one part of the body to the other part is called nerve cell or neuron. A neuron is divided into three parts cell body, axon and dendrites. Cell body is the main cellular part of the neuron. All the protein synthesis occurs in cell body. Axon is the longest extension arising from thecell body. It carries electrical impulse away from the cell body. Sometimes the neuron has insulation sheet called myelin associated with it. Those neurons are called myelinated nerve cell. It increases the velocity of the impulse carried by the nerve. These type of neuron found in theperipheral nervous system. Dendrites are the short but numerous extension arising from the cell body. They carry impulse from other neurons into the cell body.
There are three types of neuron on the basis of work performed by them. They are
Human nervous system is divided into three parts. They are:
The main components of nervous system are brain, spinal cord and nerves.
Nervous system can be divided into two groups-
a. Central nervous system with brain and spinal cord
b. Peripheral nervous system with different types of neurons.
There are three different types of neuron. They are:
a. Sensory neuron: It takes the impulses from sense organs (receptors) to the central nervous system.
b. Motor neuron: It takes the impulses from the central nervous system to the muscles (effecters).
c. Inter neuron: It links sensory neuron to motor neuron.
The nerve cell bears branches, one of which is longer and is protected by medullary sheath is called axon.
Dendrite is defined as a small branch of the nerve cell which carries stimulation and reaction towards the spinal cord.
The cells that transmit the message form one part of the body to other are known as ______.
______ sends most of the impulses to the dendrites of another neuron.