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Brodmann areas

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Brodmann area
Brodmann areas 3D.png
3D representation of Brodmann areas
Details
Part of Cerebrum
Identifiers
NeuroNames 427
FMA 68596
Anatomical terms of neuroanatomy

A Brodmann area is a region of the cerebral cortex, in the human or otherprimate brain, defined by its cytoarchitecture, or histological structure and organization of cells.

History

A number of important Brodmann areas have been marked out on this diagram.

Brodmann areas were originally defined and numbered by the German anatomist Korbinian Brodmann based on the cytoarchitectural organization of neurons he observed in the cerebral cortex using the Nissl method of cell staining. Brodmann published his maps of cortical areas in humans, monkeys, and other species in 1909, along with many other findings and observations regarding the general cell types and laminar organization of the mammalian cortex. The same Brodmann area number in different species does not necessarily indicate homologous areas. A similar, but more detailed cortical map was published by Constantin von Economo and Georg N. Koskinas in 1925.

Present importance

Brodmann areas have been discussed, debated, refined, and renamed exhaustively for nearly a century and remain the most widely known and frequently cited cytoarchitectural organization of the human cortex.

Many of the areas Brodmann defined based solely on their neuronal organization have since been correlated closely to diverse cortical functions. For example, Brodmann areas 3, 1 and 2 are the primary somatosensory cortex; area 4 is the primary motor cortex; area 17 is the primary visual cortex; and areas 41 and 42 correspond closely to primary auditory cortex. Higher order functions of the association cortical areas are also consistently localized to the same Brodmann areas by neurophysiological, functional imaging, and other methods (e.g., the consistent localization of Broca's speech and language area to the left Brodmann areas 44 and 45). However, functional imaging can only identify the approximate localization of brain activations in terms of Brodmann areas since their actual boundaries in any individual brain require its histological examination.

Overview

Brodmann's classification of areas of the cortex

Different parts of the cerebral cortex are involved in different cognitive and behavioral functions. The differences show up in a number of ways: the effects of localized brain damage, regional activity patterns exposed when the brain is examined using functional imaging techniques, connectivity with subcortical areas, and regional differences in the cellular architecture of the cortex. Neuroscientists describe most of the cortex—the part they call the neocortex—as having six layers, but not all layers are apparent in all areas, and even when a layer is present, its thickness and cellular organization may vary. Scientists have constructed maps of cortical areas on the basis of variations in the appearance of the layers as seen with a microscope. One of the most widely used schemes came from Korbinian Brodmann, who split the cortex into 52 different areas and assigned each a number (many of these Brodmann areas have since been subdivided). For example, Brodmann area 1 is the primary somatosensory cortex, Brodmann area 17 is the primary visual cortex, and Brodmann area 25 is the anterior cingulate cortex.

Topography of the primary motor cortex, showing which zone controls each body part

Many of the brain areas defined by Brodmann have their own complex internal structures. In a number of cases, brain areas are organized into topographic maps, where adjoining bits of the cortex correspond to adjoining parts of the body, or of some more abstract entity. A simple example of this type of correspondence is the primary motor cortex, a strip of tissue running along the anterior edge of the central sulcus. Motor areas innervating each part of the body arise from a distinct zone, with neighboring body parts represented by neighboring zones. Electrical stimulation of the cortex at any point causes a muscle-contraction in the represented body part. This "somatotopic" representation is not evenly distributed, however; the head, for example, is represented by a region about three times as large as the zone for the entire back and trunk. The size of any zone correlates to the precision of motor control and sensory discrimination possible. The areas for the lips, fingers, and tongue are particularly large, considering the proportional size of their represented body parts.

The maps for visual areas are retinotopic, meaning that they reflect the topography of the retina: the layer of light-activated neurons lining the back of the eye. In this case too, the representation is uneven: the fovea—the area at the center of the visual field—is greatly overrepresented compared to the periphery. The visual circuitry in the human cerebral cortex contains several dozen distinct retinotopic maps, each devoted to analyzing the visual input stream in a particular way. The primary visual cortex (Brodmann area 17), which is the main recipient of direct input from the visual part of the thalamus, contains many neurons that are most easily activated by edges with a particular orientation moving across a particular point in the visual field. Visual areas farther downstream extract features such as color, motion, and shape.

In auditory areas, the primary map is tonotopic. Sounds are parsed according to frequency (i.e., high pitch vs. low pitch) by subcortical auditory areas, and this parsing is reflected by the primary auditory zone of the cortex. As with the visual system, there are a number of tonotopic cortical maps, each devoted to analyzing sound in a particular way.

Within a topographic map there can sometimes be finer levels of spatial structure. In the primary visual cortex, for example, where the main organization is retinotopic and the main responses are to moving edges, cells that respond to different edge-orientations are spatially segregated from one another.

For humans and other primates

(*) Area only found in non-human primates.

Some of the original Brodmann areas have been subdivided further, e.g., "23a" and "23b".

Clickable map: lateral surface

Note: the lateral view, or side view, of the brain is denoted the 'lateral surface'
Areas 3, 1 & 2 – Primary Somatosensory Cortex Area 4 – Primary Motor Cortex Area 5 – Somatosensory Association Cortex Area 6 – Premotor cortex and Supplementary Motor Cortex (Secondary Motor Cortex)(Supplementary motor area Area 7 – Somatosensory Association Cortex Area 8 – Includes Frontal eye fields Area 9 – Dorsolateral prefrontal cortex Area 10 – Anterior prefrontal cortex Area 11 – Orbitofrontal area Area 17 – Primary visual cortex (V1) Area 18 – Secondary visual cortex (V2) Area 19 – Associative visual cortex (V3) Area 20 – Inferior temporal gyrus Area 21 – Middle temporal gyrus Area 22 – Superior temporal gyrus Area 37 – Fusiform gyrus Area 38 – PULA Area 39 – Angular gyrus Area 40 – Supramarginal gyrus Area 41 – Primary and Auditory Association Cortex Area 42 – Primary and Auditory Association Cortex Area 43 – Primary gustatory cortex Area 44 – pars opercularis, part of Broca's area Area 45 – pars triangularis, Broca's area Area 46 – Dorsolateral prefrontal cortex Area 47 – Inferior prefrontal gyrus Image MapImage mapped Brodmann Areas. Clicking on an area in the picture causes the browser to load the appropriate article.
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Clickable map: medial surface

Note: the view of the section between the right and left hemispheres of the brain is denoted the 'medial surface'
Areas 3, 1 & 2 – Primary Somatosensory Cortex area 4 – primary motor cortex Area 5 – Somatosensory Association Cortex Area 6 – Premotor cortex and Supplementary Motor Cortex (Secondary Motor Cortex)(Supplementary motor area Area 7 – Somatosensory Association Cortex Area 8 – Includes Frontal eye fields Area 9 – Dorsolateral prefrontal cortex Area 10 – Anterior prefrontal cortex Area 11 – Orbitofrontal area Area 12 – Orbitofrontal area Area 17 – Primary visual cortex (V1) Area 18 – Secondary visual cortex (V2) Area 19 – Associative visual cortex (V3) Area 19 – Associative visual cortex (V3) Area 18 – Secondary visual cortex (V2) Area 23 – Ventral Posterior cingulate cortex Area 24 – Ventral Anterior cingulate cortex Area 25 – Subgenual cortex (part of the Ventromedial prefrontal cortex) Area 26 – Ectosplenial portion of the retrosplenial region of the cerebral cortex Area 27 – Piriform cortex Area 28 – Posterior Entorhinal Cortex Area 29 – Retrosplenial cingulate cortex Area 30 – Part of cingulate cortex Area 31 – Dorsal Posterior cingulate cortex Area 32 – Dorsal anterior cingulate cortex Area 33 – Part of anterior cingulate cortex Area 34 – Anterior Entorhinal Cortex (on the Parahippocampal gyrus) Area 35 – Perirhinal cortex (on the Parahippocampal gyrus) Area 20 – Inferior temporal gyrus Area 37 – Fusiform gyrus Area 38 – Temporopolar area Image MapImage mapped Brodmann Areas. Clicking on an area in the picture causes the browser to load the appropriate article.
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Criticism

When von Bonin and Bailey constructed a brain map for the macaque monkey they found the description of Brodmann inadequate and wrote: "Brodmann (1907), it is true, prepared a map of the human brain which has been widely reproduced, but, unfortunately, the data on which it was based was never published" They instead used the cytoarchitectonic scheme of Constantin von Economo and Georg N. Koskinas published in 1925 which had the "only acceptable detailed description of the human cortex".

See also

External links

  • [1] - Brodmann Areas, their functions, and the lateralization of functions across hemispheres
  • Brodmann, Mark Dubin pages on Brodmann areas.
  • Brodmann areas Brodmann areas of cortex involved in language.
  • Brodmann Illustrations BrainInfo Illustrations.

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