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Related Concept Videos

Motor Units01:13

Motor Units

The motor unit is a fundamental component of the neuromuscular system and plays a crucial role in coordinating muscle contractions. It consists of a somatic motor neuron, which connects and controls multiple skeletal muscle fibers, forming a single functional segment. The axon of the motor neuron branches out and establishes synaptic connections known as neuromuscular junctions with individual muscle fibers within the motor unit.
Motor units come in different sizes, with smaller units...
Motor Units00:46

Motor Units

A motor unit consists of two main components: a single efferent motor neuron (i.e., a neuron that carries impulses away from the central nervous system) and all of the muscle fibers it innervates. The motor neuron may innervate multiple muscle fibers, which are single cells, but only one motor neuron innervates a single muscle fiber.
Nervous Tissue: Neuron Types01:19

Nervous Tissue: Neuron Types

Neurons, the fundamental units of the nervous system, can be classified based on both their structural and functional characteristics.
Structurally, neurons are categorized into three main types: multipolar, bipolar, and unipolar (or pseudounipolar). Multipolar neurons, which are the most common type in the brain and spinal cord, as well as all motor neurons, possess multiple dendrites and a single axon.
Bipolar neurons, on the other hand, have one primary dendrite and one axon. They are...

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Related Experiment Video

Updated: Jun 14, 2026

Modeling Charcot-Marie-Tooth Disease In Vitro by Transfecting Mouse Primary Motoneurons
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Published on: January 7, 2019

Motor neuron diversity in development and disease.

Kevin C Kanning1, Artem Kaplan, Christopher E Henderson

  • 1Department of Pathology, Center for Motor Neuron Biology and Disease, Columbia University Medical Center, New York, NY 10032, USA.

Annual Review of Neuroscience
|April 7, 2010
PubMed
Summary

Spinal motor neurons exhibit significant diversity, influencing their response to neurodegenerative diseases like ALS. Understanding these differences offers new therapeutic targets for motor neuron diseases.

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Area of Science:

  • Neuroscience
  • Motor Neuron Biology
  • Neurodegeneration

Background:

  • Spinal motor neurons are diverse in morphology, connectivity, and function, not a homogenous group.
  • This diversity impacts their susceptibility and response to neurodegenerative diseases such as amyotrophic lateral sclerosis (ALS).

Purpose of the Study:

  • To explore the diversity of spinal motor neurons.
  • To understand how this diversity influences disease mechanisms in neurodegenerative conditions.
  • To identify potential therapeutic targets for motor neuron diseases.

Main Methods:

  • Review of recent studies on motor neuron development and diversity.
  • Analysis of differential responses of motor neuron subtypes in disease models.
  • Investigation of glial cell line-derived neurotrophic factor (GDNF) effects on motor neuron subtypes.

Main Results:

  • Motor neuron classes and subtypes (e.g., fast/slow, alpha/gamma) form distinct motor pools.
  • Glial cell line-derived neurotrophic factor (GDNF) exhibits pool-, column-, and subtype-specific effects.
  • Fast-fatigable motor units degenerate early in ALS, spinal muscular atrophy (SMA), and aging, while others are preserved.

Conclusions:

  • Motor neuron diversity is crucial for understanding neurodegeneration.
  • Specific motor neuron populations show differential vulnerability and resistance.
  • Mechanisms conferring resistance in preserved motor neurons are promising therapeutic targets for incurable diseases.