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Related Concept Videos

Functional Brain Systems: Limbic System01:15

Functional Brain Systems: Limbic System

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The limbic system, often called the "emotional brain," is a complex set of structures located deep within the brain. The intricate network of the limbic system supports a wide range of psychological functions, from emotional regulation to memory formation and sensory processing. This functional brain region encompasses specific parts of the diencephalon and the cerebrum, integrating the higher mental functions of the cerebral cortex with the primitive emotional responses of the deep brain...
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Lobes of the Cerebrum01:22

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The cerebral cortex, a critical structure of the brain, is intricately divided into two hemispheres, each consisting of four distinct lobes: occipital, temporal, frontal, and parietal. These lobes function cooperatively to regulate various cognitive and sensory functions, forming the basis of our complex neural capabilities.
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Somatosensory, Motor, and Association Cortex01:24

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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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Motor and Sensory Areas of the Cortex01:14

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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.
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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....
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Cerebrum: Anatomical Overview II01:11

Cerebrum: Anatomical Overview II

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Each cerebral hemisphere can be divided into three main regions. The outermost region, the cerebral cortex, is a thin layer (2 to 4 millimeters thick) made up of gray matter, consisting of neuron cell bodies, dendrites, glial cells, and blood vessels. The middle region, or white matter, is primarily composed of myelinated nerve fibers organized into three types of large tracts: association fibers, commissures, and projection fibers. Association fibers connect different areas within the same...
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Cerebrum: Anatomical Overview I01:26

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The main and largest component of the human brain is the cerebrum. The cerebrum consists of two main parts: the cerebral cortex, an outer layer with wrinkles or folds known as gyri and shallow grooves called sulci, and a deeper region beneath it. The cerebrum divides into two distinct hemispheres and contains five different lobes: the frontal, parietal, temporal, occipital, and insula. The central sulcus separates the frontal and parietal lobes and two functionally important gyri — the...
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Investigating the Function of Deep Cortical and Subcortical Structures Using Stereotactic Electroencephalography: Lessons from the Anterior Cingulate Cortex
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Cingulate cortex in the three limbic subsystems.

Brent A Vogt1

  • 1Cingulum Neurosciences Institute, Manlius, NY, United States; Department of Anatomy and Neurobiology, Boston University School of Medicine, Boston, MA, United States.

Handbook of Clinical Neurology
|November 17, 2019
PubMed
Summary
This summary is machine-generated.

The limbic system is not a single entity but comprises multiple subsystems, including anterior emotional, middle sensorimotor, and posterior cognitive spatial map subsystems. Further analysis suggests six distinct limbic subsystems may better represent its complex organization.

Keywords:
AmygdalaConnectionsEmotionHippocampusInsulaOrbitofrontal cortexResponse selectionVisuospatial orientation

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Area of Science:

  • Neuroscience
  • Neuroanatomy
  • Cognitive Neuroscience

Background:

  • Historically, the limbic system was defined by Broca, Papez, and MacLean as a collection of medial surface structures.
  • Recent research reveals extensive details on limbic system connectivity and functions, challenging its view as a singular, uniform system.
  • The cingulate cortex, a key component, exhibits three divisions (anterior, middle, posterior) with distinct cytoarchitectures and functions.

Purpose of the Study:

  • To propose a revised framework for limbic system organization based on its functional and connectional heterogeneity.
  • To delineate three primary limbic subsystems: anterior emotional, middle sensorimotor, and posterior cognitive spatial map.
  • To explore the implications of cingulate cortex subdivisions for a more granular understanding of limbic organization.

Main Methods:

  • Analysis of existing research on limbic system connectivity and function.
  • Re-evaluation of the cingulate cortex's structure and its role in limbic organization.
  • Conceptual integration of structures like the amygdala, orbitofrontal cortex, insula, hippocampus, and cingulate cortex into subsystems.

Main Results:

  • The limbic system is better understood as at least three distinct subsystems, not a single entity.
  • The anterior emotional subsystem is characterized by amygdala input.
  • The middle hippocampus and anterior midcingulate cortex show shared roles in approach-avoidance decision-making.
  • A finer-grained analysis of the cingulate cortex suggests the potential existence of six limbic subsystems.

Conclusions:

  • The traditional concept of 'a' limbic system requires significant revision to reflect its complex, multi-subsystem organization.
  • The proposed three (or potentially six) limbic subsystems offer a more accurate model for understanding brain function.
  • This revised framework highlights the specialized roles of different limbic components in emotion, sensorimotor control, and spatial cognition.