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Motor and Sensory Areas of the Cortex

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....

Somatosensory, Motor, and Association Cortex

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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...

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Primary Motor Cortex Involvement and Its Association With Seizure Risk in Patients With Brain Metastases.

Clara Baselga-Garriga¹, Sandeep Purohit², Nayan Lamba²

¹Department of Internal Medicine, Massachusetts General Hospital, Boston.

|February 26, 2026

Summary

This summary is machine-generated.

Brain metastases (BMs) in the primary motor cortex significantly increase seizure risk in patients. Further research into prophylactic antiseizure medications for this population is suggested.

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A Multimodal Imaging- and Stimulation-based Method of Evaluating Connectivity-related Brain Excitability in Patients with Epilepsy

A Multimodal Imaging- and Stimulation-based Method of Evaluating Connectivity-related Brain Excitability in Patients with Epilepsy

Published on: November 13, 2016

Area of Science:

Neurology
Oncology
Neuro-oncology

Background:

Seizures are a common complication of brain metastases (BMs), impacting patient quality of life.
The specific risk of seizures associated with the location of BMs is not well understood.
Non-oncologic literature suggests a link between primary motor cortex disruption and seizure predisposition.

Purpose of the Study:

To evaluate whether brain metastases located in the primary motor cortex are associated with a higher risk of seizures compared to BMs in other brain regions.
To investigate the relationship between the location of brain metastases and seizure occurrence in patients.

Main Methods:

Retrospective cohort study of 3,043 patients with brain metastases diagnosed between 2003 and 2022.
Covariables included demographic, clinical, oncologic, and treatment-related factors.
Statistical analyses utilized univariable/multivariable logistic and Fine and Gray competing risks regression to assess seizure risk associated with primary motor cortex BMs.

Main Results:

Patients with primary motor cortex BMs had a significantly increased risk of seizures at diagnosis (OR 2.87) and subsequently (HR 1.95).
Among patients who developed new BMs, those with primary motor cortex involvement were more likely to experience seizures (HR 2.11).
18.7% of patients had BMs in the primary motor cortex, compared to 81.3% without.

Conclusions:

Brain metastases located in the primary motor cortex are associated with an elevated risk of seizures.
Routine prophylactic antiseizure medication use is not recommended based on this retrospective data.
Dedicated clinical trials investigating prophylactic antiseizure medications for patients with primary motor cortex BMs are warranted.