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Motor Units

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 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.

Hierarchy of Motor Control

Hierarchy of Motor Control

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.

Motor Unit Stimulation

Motor Unit Stimulation

When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...

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Related Experiment Video

Updated: Dec 27, 2025

A Method for Evaluating Timeliness and Accuracy of Volitional Motor Responses to Vibrotactile Stimuli

A Method for Evaluating Timeliness and Accuracy of Volitional Motor Responses to Vibrotactile Stimuli

Published on: August 2, 2016

Robustness in an Ultrasensitive Motor.

Guangzhe Liu¹, Antai Tao¹, Rongjing Zhang²

¹Hefei National Laboratory for Physical Sciences at the Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui, China.

|March 5, 2020

Summary

The bacterial flagellar motor maintains consistent rotation despite cell-to-cell variations in FliM protein levels. This robustness is achieved through adaptive remodeling of the motor

Keywords:

adaptive remodeling flagellar motor molecular motor sensitivity

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Last Updated: Dec 27, 2025

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Area of Science:

Microbiology
Biophysics
Cellular Biology

Background:

The bacterial flagellar motor controls motility in Escherichia coli.
Chemotaxis response regulator CheY-P binding to FliM modulates motor rotation direction.
The motor exhibits ultrasensitivity to unbound CheY-P concentration.

Purpose of the Study:

To investigate the robustness of the bacterial flagellar motor against variations in FliM concentration.
To identify the underlying mechanism responsible for this robustness.

Main Methods:

The study focused on analyzing the interaction between CheY-P and FliM in Escherichia coli.
Investigated the motor's output (rotational bias) under varying FliM concentrations.
Identified adaptive remodeling of the motor's switch complex as a key mechanism.

Main Results:

The bacterial flagellar motor demonstrates robustness against cell-to-cell variations in FliM concentration.
Adaptive remodeling of the motor's switch complex compensates for changes in FliM levels.
This compensation maintains a stable motor output despite molecular concentration fluctuations.

Conclusions:

The bacterial flagellar motor is robust to variations in its component FliM concentration.
Adaptive remodeling of the switch complex is the mechanism ensuring motor output stability.
This adaptability is crucial for consistent bacterial chemotaxis and motility.