Parietal Lobe

The parietal lobe (or parietal cortex ) is an area of the Cerveau Vertébré S. It is located behind frontal Lobe, with the top of the lobes temporal and occipital.

Anatomy

From an anatomical point of view, the parietal lobe is an external relief of the brain delimited by furrows:

the central Sillon (in the past fissure of Rolando ) separates the frontal Lobe from the parietal lobe ahead
the posterior limit of the parietal lobe with the occipital Lobe is marked by the pariéto-occipital Sillon (old perpendicular fissure interns ) which is not always quite visible.
the side Sillon (old fissure of Sylvius ) established a border enters the inferior part of the parietal lobe and the temporal Lobe
the cerebral Fissure logitudinale in top, separating it from the parietal lobe controlatéral.

The parietal lobe is generally cut out in three principal structures (old convolutions ):

the Gyrus postcentral (P3) seat of the Somesthésie, located between the central Furrow ahead and the furrow postcentral behind. This gyrus present at its base the parietal Cover in extreme cases of the side Furrow.
the lower parietal Lobule (P2) being divided into Gyrus supramarginal ahead and angular Gyrus behind
the higher parietal Lobule (P1) separated from the lower parietal lobule by the Furrow intrapariétal.

Function

The parietal lobe is regarded as an associative center hétéromodal. I.e. he plays a big role in the integration of information resulting from different the sensory methods (Vision, Toucher, Audition). This area of the brain is in particular implied in the Perception of space and in the Attention (particularly visual).

The parietal cortex was the subject of less scientific studies in Neurosciences than the other areas of the brain. Consequently, its functions remain still rather badly known today.

During the evolution of the man and Primates, the parietal lobe, just like the frontal lobe, underwent important a cortical Expansion i.e. the size of this area increased more quickly than the remainder of the brain.

Neuropsychology

A Lésion (following a Cerebral vascular accident for example) located in the parietal cortex can have consequences striking the behavior. Thus, when the lesion strikes the parietal lobe in the Hémisphère not-dominating, the patient can suffer from Héminégligence space: he behaves like if he " any more conscience" did not have; of a whole half of space (in general contralatéral with the lesion).

See too

the lobes of the brain

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