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Muscle Coordination and Action

Muscle Coordination and Action

Muscle coordination is a complex and finely tuned process essential for smooth and purposeful movements like flexion, extension, adduction, abduction, and rotation. The human body orchestrates the actions of various muscles working in concert, each with a specific role. Four functional types describe how muscles work together: agonist, antagonist, synergist, and fixator.
Agonists
Agonist muscles, often called prime movers, are the primary muscles responsible for producing a specific movement....

Muscles that Move the Arm

Muscles that Move the Arm

Nine muscles are involved in arm movements. Two of these, the pectoralis major and latissimus dorsi, originate from the axial skeleton and are called axial muscles. The other seven originate from the scapula and are called the scapular muscles.
The pectoralis major has two origins. Its clavicular head originates on the medial half of the clavicle. In contrast, the sternocostal head originates on the costal cartilages of ribs 1-6, the sternum, and the aponeurosis of the external oblique of the...

Muscles of the Forearm that Move the Hand and Fingers

Muscles of the Forearm that Move the Hand and Fingers

The muscles of the forearm that move the wrist, hand, and digits are numerous and diverse. They can be classified into two groups based on their location and function — the anterior and posterior compartment muscles.
Anterior Compartment
The anterior compartment muscles originate from the humerus. They primarily function as flexors and are also known as flexor muscles. They typically insert on the carpals, metacarpals, and phalanges. The superficial layer includes the flexor carpi...

Muscles that Move the Forearm

Muscles that Move the Forearm

The muscles that move the forearms can be divided into four groups: forearm flexors, forearm extensors, forearm pronators, and forearm supinators. The flexors and extensors act on the elbow joint, while the pronators and supinators act on the radioulnar joints.
Forearm Flexors
The biceps brachii, brachialis, and brachioradialis are forearm flexors. The biceps brachii is made up of two heads. Its long head originates at the supraglenoid tubercle of the scapula, whereas that of the short head is...

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Related Experiment Video

Updated: Dec 31, 2025

Author Spotlight: Enhancing Post-Stroke Upper Limb Rehabilitation with Robotic Technologies for Improved Motor Recovery and Functional Outcomes

Author Spotlight: Enhancing Post-Stroke Upper Limb Rehabilitation with Robotic Technologies for Improved Motor Recovery and Functional Outcomes

Published on: September 6, 2024

Biceps Brachii Muscle Synergy and Target Reaching in a Virtual Environment.

Liang He¹, Pierre A Mathieu¹

¹Department of Pharmacology and Physiology, Biomedical Engineering Institute, Université de Montréal, Montréal, QC, Canada.

Frontiers in Neurorobotics

|January 11, 2020

Summary

Researchers explored how biceps muscle synergies could control advanced myoelectric prostheses. This study demonstrates the potential of using muscle synergies for intuitive prosthetic limb control, even with a single muscle group.

Keywords:

biceps brachii muscle synergy myoelectric prosthesis target reaching upper limb posture classification virtual cube

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An Emerging Target Paradigm to Evoke Fast Visuomotor Responses on Human Upper Limb Muscles

An Emerging Target Paradigm to Evoke Fast Visuomotor Responses on Human Upper Limb Muscles

Published on: August 25, 2020

Area of Science:

Biomechanics
Neuroscience
Prosthetics Engineering

Background:

The central nervous system employs muscle synergies to simplify complex movements.
Modern upper limb prostheses require sophisticated control strategies for their multiple degrees of freedom.

Purpose of the Study:

To investigate if muscle synergies extracted from a single muscle (biceps) can generate distinct signals.
To assess the potential of these signals in facilitating the control of multi-degree-of-freedom myoelectric prostheses.

Main Methods:

Electromyographic (EMG) signals were recorded from the biceps of 12 subjects in various static postures.
Muscle synergies were extracted from EMG data and used to train a classifier.
Subjects controlled a virtual object in a 3D space using recognized posture-based synergies.

Main Results:

A classifier successfully identified distinct muscle synergy patterns associated with specific static postures.
Subjects could, with effort, reach targets in a virtual environment using biceps muscle synergies.
This study serves as a proof of concept for utilizing biceps muscle synergy features.

Conclusions:

Biceps brachii muscle synergies contain features that show potential for enhancing myoelectric prosthesis control.
This approach may offer a simplified yet effective method for controlling complex prosthetic limbs.
This represents a novel finding in the field of prosthetic control.