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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.
The vestibulospinal tract originates in the vestibular nuclei of the brainstem. The vestibular system detects changes in...

Muscles that Move the Leg

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The movement of the legs is facilitated by numerous muscles located within the anterior, medial, and posterior compartments of the thigh.
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Major Somatic Sensory Pathways

Major Somatic Sensory Pathways

Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the posterior columns...

Overview of Somatic Sensory Pathways

Overview of Somatic Sensory Pathways

Somatic sensory or somatosensory pathways refer to the neural pathways that carry information related to touch, pressure, pain, temperature, and proprioception from the skin, muscles, tendons, and joints to the brain. These pathways involve several stages of processing and integration of sensory information.
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Direct Motor Pathways

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Knee Joint

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Related Experiment Video

Updated: Jun 18, 2026

An Experiment Using Functional Near-Infrared Spectroscopy and Robot-Assisted Multi-Joint Pointing Movements of the Lower Limb

An Experiment Using Functional Near-Infrared Spectroscopy and Robot-Assisted Multi-Joint Pointing Movements of the Lower Limb

Published on: June 7, 2024

Group I afferent pathway contributes to functional knee stability.

B Friemert¹, S Franke, A Gollhofer

¹Trauma Research Group, German Armed Forces Hospital Ulm, Ulm, Germany.

Journal of Neurophysiology

|December 4, 2009

Summary

This summary is machine-generated.

The hamstring short-latency reflex (SLR) is mediated by Ia afferents, crucial for knee stability. Suppressing this reflex increases anterior tibial translation, highlighting its protective role in knee joint stabilization.

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Last Updated: Jun 18, 2026

An Experiment Using Functional Near-Infrared Spectroscopy and Robot-Assisted Multi-Joint Pointing Movements of the Lower Limb

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A Human-machine-interface Integrating Low-cost Sensors with a Neuromuscular Electrical Stimulation System for Post-stroke Balance Rehabilitation

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Published on: April 12, 2016

Area of Science:

Neuroscience
Biomechanics
Kinesiology

Background:

The hamstring reflex is vital for stabilizing the knee during anterior tibial translation.
Understanding the afferent pathways involved is key to comprehending knee joint stability.

Purpose of the Study:

To identify the specific afferent pathways contributing to hamstring reflexes (SLR and MLR).
To investigate the impact of these afferent pathways on functional knee stability.

Main Methods:

Evoked short- and medium-latency hamstring reflexes (SLR and MLR) via anterior tibial translation in 35 healthy subjects.
Utilized nerve cooling, tizanidine (group II afferent suppressor), and ischemia to differentiate afferent pathways.
Measured reflex latency, size, and maximum tibial translation under experimental conditions.

Main Results:

Nerve cooling increased MLR and SLR latency.
Tizanidine significantly reduced MLR size but not SLR.
Ischemia significantly reduced SLR size, leading to increased anterior tibial translation.

Conclusions:

Hamstring SLR is primarily mediated by Ia afferents.
Group II afferents mainly contribute to the hamstring MLR.
Ia afferent suppression impairs knee stability by increasing anterior tibial translation.