Neuron

Neurons (also spelled neurones or called nerve cells) are the primary cells of the nervous system.

Classes

There are three classes of neurons: afferent neurons, efferent neurons, and interneurons.

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• Afferent neurons convey information from tissues and organs into the central nervous system.
• Efferent neurons transmit signals from the central nervous system to the effector cells.
• Interneurons connect neurons within the central nervous system.

Structural classification

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• Pseudounipolar- single dendrite longer than single axon
• Bipolar - single axon and single dendrite equal length
• Multipolar - more than two dendrites
• Golgi I- pyramidal cell
• Golgi II- granule (stellate) cell