Intraparietal Sulcus

The intraparietal sulcus may be formed by various combinations of its three phylogenetic components: a rostral vertical component, the postcentral inferior and superior sulci; a middle horizontal component, the intraparietal proper; and a caudal component, the paroccipital.

The inferior and superior postcentral components may separate from the intraparietal sulcus proper and join the postcentral sulcus. The inferior postcentral sulcus may terminate in a forked fashion with the anterior branch directed toward the lower concavity of the central sulcus. Occasionally, the inferior postcentral sulcus gives rise below the bifurcation to the sulcus retrocentralis (postcentralis) transversus. The development of the transverse retrocentral (postcentral) sulcus bears an inverse relationship to the development of the subcentral posterior sulcus situated close to the sylvian fissure. The transverse postcentral and the subcentral sulci may join the sylvian fissure.

The relationship of the horizontal component (intraparietal sulcus proper) to the superior and inferor postcentral sulci has been described under five categories: in category 1, all three sulci are separate; in category 2, the horizontal component is continuous with the inferior postcentral component; in category 3, the superior and inferior postcentral sulci are confluent and are separate from the intraparietal sulcus proper; in category 4, all three components are continuous with other; and in category 5, the horizontal component is continuous with the superior postcentral component.

The intraparietal sulcus proper may have one or two dorsal branches extending into the superior parietal lobule and continuous with one or more of its sulci. One or more short ventral branches may also extend into the inferior parietal lobule. One of these branches, the intermedius primus or anterior, marks the boundry between the supramarginal and angular gyri. The intermedius primus or anterior, may be continous with the superior temporal sulcus. Another branch, the sulcus angularis, may be axial to the angular gyrus, and it may be continuous with the superior temporal sulcus. The sulcus intermedius posterior is very variable and represents another inferior branch of the intraparietal sulcus proper.

Riferimenti dell’opera originale

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