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Major Somatic Sensory Pathways

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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...

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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.
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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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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.
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The sympathetic pathways of the collateral ganglia and adrenal medulla serve unique but interconnected roles in the sympathetic response.
Collateral Ganglia
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Related Experiment Video

Updated: Jun 13, 2026

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The nigrostriatal pathway: axonal collateralization and compartmental specificity.

L Prensa¹, J M Giménez-Amaya, A Parent

¹Departamento de Anatomía, Histología y Neurociencia, Facultad de Medicina, Universidad Autónoma de Madrid, 28029 Madrid, Spain. lucia.prensa@uam.es

Journal of Neural Transmission. Supplementum

|April 24, 2010

Summary

This study reveals how nigrostriatal pathway neurons branch and target specific brain areas. Understanding these connections is key to comprehending basal ganglia function and Parkinson's disease.

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Published on: March 11, 2020

Area of Science:

Neuroscience
Neuroanatomy

Background:

The nigrostriatal pathway is crucial for motor control.
Its complex circuitry and neuronal targeting remain areas of active research.

Purpose of the Study:

To review axonal collateralization and compartmental specificity of the nigrostriatal pathway.
To elucidate the anatomical basis of nigrostriatal circuitry in health and disease.

Main Methods:

Single-axon labeling experiments in rodents.
Immunocytological analysis of human postmortem tissue.

Main Results:

Nigrostriatal neurons exhibit extensive axonal branching within the basal ganglia, thalamus, and pedunculopontine tegmental nucleus.
The matrix compartment of the striatum receives dense dopaminergic innervation, while striosomes show variable innervation.
Ventral tier substantia nigra pars compacta neurons, projecting to the matrix, are most affected in Parkinson's disease.

Conclusions:

The nigrostriatal pathway's collateralization and compartmental specificity are key features of basal ganglia organization.
These anatomical details provide insights into the neurodegeneration observed in Parkinson's disease.