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Motor Units

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.

Indirect Motor Pathways

Indirect Motor Pathways

The indirect motor or extrapyramidal pathways originate in the brainstem, the lower portion of the brain that connects it to the spinal cord. They consist of several distinct tracts, each with specialized functions. The four main tracts of the indirect motor pathways are the vestibulospinal tract, the reticulospinal tract, the tectospinal tract, and the rubrospinal tract.
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Direct Motor Pathways

Direct Motor Pathways

The direct motor pathways, also known as the pyramidal tracts, are a group of neural pathways that originate in the brain and descend through the spinal cord. They control the voluntary movement of the body. There are two major direct motor pathways: the corticospinal and the corticobulbar tracts.
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Motor Units

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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.
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The hierarchy of motor control refers to the different levels of organization and processing involved in controlling movement in the body. These levels range from higher cortical areas involved in planning and decision-making to lower spinal cord reflexes that respond automatically to external stimuli.

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Zero-sequence current induces a voltage drop across the generator's neutral impedance and other...

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Related Experiment Video

Updated: Feb 28, 2026

In Vivo Wireless Optogenetic Control of Skilled Motor Behavior

In Vivo Wireless Optogenetic Control of Skilled Motor Behavior

Published on: November 22, 2021

Motor networks: shifting coalitions.

Ronald L Calabrese¹

¹Department of Biology, Emory University, Atlanta, Georgia 30322, USA. ronald.calabrese@emory.edu

Current Biology : CB

|February 20, 2007

Summary

Central motor networks utilize multifunctional neurons that form shifting coalitions for diverse tasks, rather than relying on dedicated, task-specific neurons. This finding reveals a dynamic organization of neural circuits for motor control.

Area of Science:

Neuroscience
Motor Control
Systems Neuroscience

Background:

The organization of central motor networks remains a key question in neuroscience.
Understanding whether neurons are specialized for single tasks or contribute to multiple functions is crucial for deciphering motor control mechanisms.

Purpose of the Study:

To investigate the functional organization of central motor networks.
To determine if neurons within motor networks are task-specific or multifunctional.

Main Methods:

Recent experimental approaches were employed.
Analysis focused on neuronal activity during different tasks.

Main Results:

Experimental evidence strongly supports the multifunctional nature of neurons.

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Neurons dynamically form shifting coalitions to create functional networks for specific tasks.

Conclusions:

Central motor networks are not composed of dedicated, task-specific neurons.
Neurons are multifunctional and participate in flexible, task-dependent network formations.