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Question

Give detailed difference between afferent and efferent fibres of CNS

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Solution

1. Afferent neurons are the neurons that carry sensory impulses towards the CNS.
Efferent neurons are the neurons that carry motor impulses away from the CNS.
2. Afferent neurons are also known as sensory neurons.
Efferent neurons are also known as motor neurons.
3. Afferent neurons consist of a short axon.
Efferent neurons consist of a long axon.
4. Afferent neurons consist of a receptor.
Efferent neurons lack a receptor.
5. Cell body of the afferent neuron is situated in the dorsal root ganglion of the spinal cord and no dendrites are found in it.
Cell body of the efferent neuron is situated in the ventral root ganglion of the spinal cord and consists of dendrites.
6. Afferent neuron consists of one long dendron.
Efferent neuron consists of many short dendrons.
7. Afferent neurons are unipolar.
Efferent neurons are multipolar.
8. Afferent neurons are found in skin, eyes, ears, tongue, and nose.
Efferent neurons are mainly found in muscles and glands.


Afferent and efferent neurons are two components of the peripheral nervous system. Afferent neurons carry information from sensory organs towards the CNS. CNS coordinates the stimuli with relevant responses. The response of the CNS to a particular stimulus is sent to the effector organs such as glands, organs, and tissues by efferent neurons. Thus, the main difference between afferent and efferent neurons is their role in coordinating stimuli and responses in the body.


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