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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.
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...

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...

Neurons: The Axon

Neurons: The Axon

Axons are long, cytoplasmic processes of nerve cells capable of propagating electrical impulses known as action potentials. The cytoplasm or axoplasm of an axon contains neurofibrils, neurotubules, small vesicles, lysosomes, mitochondria, and various enzymes, all encased within the axolemma, the plasma membrane of the axon.
The axon attaches to the cell body at a cone-shaped elevation called the axon hillock. The initial part of the axon, closest to the hillock, is known as the initial segment.

Spinal Cord: Information Processing

Spinal Cord: Information Processing

The spinal cord is an integral hub for motor and sensory information that enables the brain to communicate with the peripheral nervous system (PNS). This communication consists of relaying sensory data and transmission of motor commands.
Sensory Information Processing
Sensory information processing begins at the sensory receptors located in the skin and other tissues, which detect somatic sensory stimuli such as touch, temperature, or pain. These receptors function as catalysts, initiating...

Spinal Cord: Cross-sectional Anatomy

Spinal Cord: Cross-sectional Anatomy

The cross-sectional anatomy of the spinal cord offers a detailed view of its complex structure and function within the central nervous system. At the core of the spinal cord lies the gray matter, characterized by its butterfly or "H"-shaped appearance in cross-section. This central region is enveloped by white matter, with the overall structure divided into symmetrical halves by the dorsal median sulcus and the ventral median fissure.
Gray Matter and its Components
Central to the gray matter is...

Action Potential

Action Potential

Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they receive...

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Related Experiment Video

Updated: Jun 14, 2026

Visualization of Motor Axon Navigation and Quantification of Axon Arborization In Mouse Embryos Using Light Sheet Fluorescence Microscopy

Visualization of Motor Axon Navigation and Quantification of Axon Arborization In Mouse Embryos Using Light Sheet Fluorescence Microscopy

Published on: May 11, 2018

Motor axon pathfinding.

Dario Bonanomi¹, Samuel L Pfaff

¹Gene Expression Laboratory, The Salk Institute for Biological Studies, La Jolla, California 92037, USA.

Cold Spring Harbor Perspectives in Biology

|March 20, 2010

Summary

This summary is machine-generated.

Motor neurons navigate complex pathways using specific ligands and receptors during development. This study explores how temporal and spatial mechanisms ensure accurate motor axon pathfinding and signaling diversity.

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Last Updated: Jun 14, 2026

Visualization of Motor Axon Navigation and Quantification of Axon Arborization In Mouse Embryos Using Light Sheet Fluorescence Microscopy

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Published on: May 11, 2018

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Published on: June 16, 2017

Axonal Transport of Organelles in Motor Neuron Cultures using Microfluidic Chambers System

Axonal Transport of Organelles in Motor Neuron Cultures using Microfluidic Chambers System

Published on: May 5, 2020

Area of Science:

Neuroscience
Developmental Biology
Molecular Biology

Background:

Motor neurons are diverse cells with specific axon guidance needs during embryonic development.
Axon guidance relies on ligands and receptors to direct motor axons to muscle targets.
Establishing complex neural connections with limited factors presents a significant challenge in neuroscience.

Purpose of the Study:

To describe the ligands and receptors involved in motor axon guidance.
To elucidate the temporal and spatial mechanisms optimizing motor pathfinding.
To understand how signaling protein diversity enhances functional outcomes.

Main Methods:

Review of existing literature on motor neuron axon guidance.
Analysis of ligand-receptor interactions in neural development.
Examination of temporal and spatial regulation of signaling pathways.

Main Results:

Identified key ligands and receptors mediating motor axon pathfinding.
Highlighted the importance of precise temporal and spatial cues.
Demonstrated mechanisms for increasing functional diversity of guidance molecules.

Conclusions:

Ligands and receptors play critical roles in directing motor axons to their targets.
Temporal and spatial control mechanisms are essential for accurate neural wiring.
Understanding these mechanisms advances knowledge of neural development and connectivity.