Related Experiment Video
Updated: May 9, 2026

Measuring and Manipulating Functionally Specific Neural Pathways in the Human Motor System with Transcranial Magnetic Stimulation
Published on: February 23, 2020
[Primary motor and primary sensory cortex are two local cortical centers of sensorimotor body representation]
Abstract:
The ipsilateral cortical associative connections of different areas of primary somatic sensory (S1) and motor (M1) cortex were studied in 25 cats after local coagulation and infusion of horseradish peroxidase. It was shown, that the distribution of the associative fiber in M1 and S1 areas corresponded to the borders of somatotopic representation of different body parts. The fields within M1 (4y, 6ab) and S1 (1,2, 3a, 3b) with different morpho-functional organization were not connected by the system of association fibers crossing the cytoarchitectonic borders of the above mentioned areas. Primary somatosensory (S1) and motor (M1) cortex had no reciprocal connections. Single fibers connected neighboring areas of M1 and S1.
Related Concept Videos
Motor and Sensory Areas of the Cortex
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.
Somatosensory, Motor, and Association Cortex
Somatosensation
Association Areas of the Cortex
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
Overview of Somatic Sensory Pathways
The somatosensory system is divided into three main pathways: the dorsal (or posterior) column-medial lemniscus, spinothalamic (or anterolateral), and spinocerebellar pathways.
The dorsal...
Major Somatic Sensory Pathways

