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Nervous System (2)

Types of Neurons, Nerves and Nerve Tracts
Carmen Lobitz
Let’s say it in English
© gorbovoi81 – stock.adobe.com
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A nerve is a bundle of nerve fibers, which are the axons of the neurons. A nerve connects the CNS with the periphery. Nerves either come from or go to the brain or spinal cord. A nerve is surrounded by connective tissue.

What types of neurons are there?

The nervous system comprises three different neuron types:

  • Sensory neurons (or afferent neurons)
  • Motor neurons (or efferent neurons)
  • Interneurons

Sensory neurons transmit action potentials (often called “spikes”) from the receptor cells of the sensory organs to the CNS (central nervous system).

Motor neurons send axons from the nervous system to the muscle cells and, thus, transmit spikes from the CNS to the effectors.

Interneurons connect different parts of the CNS with each other. They do not leave the CNS.

What about nerves and nerve tracts?

A nerve is a bundle of nerve fibers, which are the axons of the neurons. A nerve connects the CNS with the periphery. Nerves either come from or go to the brain or spinal cord. A nerve is surrounded by…

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