Superior parietal lobule

The superior parietal lobule is an anatomical subdivision of the parietal lobe of the cerebrum. He is also known as cortical sensitive side box because he neurophysiological takes over the task of the association center with respect to the somatosensory cortex.

Topography

Precuneus

The superior parietal lobule is located on the convex brain surface, bordered medially to the longitudinal fissure and passes to the medial side in the precuneus, rostral to the located on the lateral edge portion of the dentate gyrus. Laterally it is bounded by the intraparietal sulcus.

Somatotopy

The superior parietal lobule is in contrast to the somatosensory cortex not arranged segmentally and somatotopically. He represents the contralateral half of the body.

Compounds

It there are no direct afferent projection tracts (ie no primary fibers). It can be derived here only secondary potentials that do not allow assignment to specific sensory organs. Therefore, only inferences can be drawn by neurological deficits as a result of localized damage. Afferents come out of the primary master field in the somatosensory cortex only from the dorsal nucleus of the thalamus. In contrast to the closer to the central sulcus located lesions that cause a disturbance of the surface sensitivity in lesions of the superior parietal lobule, the depth sensitivity is affected.

Physiology

The task of the association center in the superior parietal lobule is that sensory stimuli are made ​​aware cf the → perception theory. To know of sensitive feeling a combined capacity of primary and secondary sensory cortical area is required.

A stove in the somatic sensory association area of ​​areae 5 and 7 by Brodmann has a tactile agnosia result. Sufferers can no longer see them down in a hand object.

The precuneus and thus the superior parietal lobule plays a role in the idle state network.