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Related Concept Videos

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.
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 and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.
Hierarchy of Motor Control01:18

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.
Direct Motor Pathways01:11

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.
The corticospinal tract is responsible for the voluntary movement of the limbs and trunk. It originates in the cerebral cortex of the brain and descends through the cerebrum's internal capsule and the...
Somatosensory, Motor, and Association Cortex01:23

Somatosensory, Motor, and Association Cortex

The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at the...

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Related Experiment Video

Updated: May 8, 2026

Force and Position Control in Humans - The Role of Augmented Feedback
06:31

Force and Position Control in Humans - The Role of Augmented Feedback

Published on: June 19, 2016

Primary motor cortex underlies multi-joint integration for fast feedback control.

J Andrew Pruszynski1, Isaac Kurtzer, Joseph Y Nashed

  • 1Centre for Neuroscience Studies, Queen's University, Kingston, Ontario, Canada.

Nature
|October 4, 2011
PubMed
Summary
This summary is machine-generated.

The nervous system integrates sensory information for perception and motor control. This study shows primary motor cortex (M1) resolves arm movement ambiguity via transcortical pathways during feedback control.

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Related Experiment Videos

Last Updated: May 8, 2026

Force and Position Control in Humans - The Role of Augmented Feedback
06:31

Force and Position Control in Humans - The Role of Augmented Feedback

Published on: June 19, 2016

Measuring and Manipulating Functionally Specific Neural Pathways in the Human Motor System with Transcranial Magnetic Stimulation
09:52

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Published on: February 23, 2020

In Vivo Wireless Optogenetic Control of Skilled Motor Behavior
07:52

In Vivo Wireless Optogenetic Control of Skilled Motor Behavior

Published on: November 22, 2021

Area of Science:

  • Neuroscience
  • Motor Control
  • Sensory Integration

Background:

  • The nervous system faces challenges integrating local sensory data for global perception.
  • Multi-joint limb control, like the arm, involves complex mechanical interactions causing ambiguity in motor commands.

Purpose of the Study:

  • To investigate how the brain resolves sensory ambiguity during fast feedback control of arm movements.
  • To determine the role of the transcortical pathway through primary motor cortex (M1) in multi-joint motor control.

Main Methods:

  • Recording neural activity in M1 of behaving rhesus monkeys during mechanical perturbations.
  • Using transcranial magnetic stimulation (TMS) in humans to probe the causal role of M1 in muscle responses.
  • Analyzing shoulder and elbow joint kinematics and muscle activity.

Main Results:

  • Single M1 neurons in monkeys integrated shoulder and elbow motion information to generate motor commands countering perturbations within ~50 ms.
  • TMS potentiated shoulder muscle responses to elbow displacement in humans, indicating M1's role in multi-joint integration.
  • Fast feedback responses mediated by M1 exhibit sophisticated control comparable to voluntary movement.

Conclusions:

  • Transcranial processing through M1 is crucial for resolving sensory ambiguity in multi-joint limb control.
  • M1 facilitates rapid, accurate feedback responses, supporting theories of voluntary movement generation through sensory feedback manipulation.