Encyclopedia entry

Precentral Sulcus

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Abstract

The precentral sulcus may be composed of two or three parts: precentral inferior, precentral medius, precentral superior. In about 17% of brains, the precentral sulcus does not show discontinuity into separate parts. The upper extremity of the precentral inferior sulcus may be located anterior to the lower end of the precentral superior sulcus or may unite with the latter forming a continuous sulcus. Occasionally, a horizontal ramus extends from the precentral inferior sulcus above the inferior frontal sulcus; this horizontal ramus may be confluent with the middle or superior frontal sulci.

The precentral sulcus may be composed of two or three parts: precentral inferior, precentral medius, precentral superior. In about 17% of brains, the precentral sulcus does not show discontinuity into separate parts.

The upper extremity of the precentral inferior sulcus may be located anterior to the lower end of the precentral superior sulcus or may unite with the latter forming a continuous sulcus. Occasionally, a horizontal ramus extends from the precentral inferior sulcus above the inferior frontal sulcus; this horizontal ramus may be confluent with the middle or superior frontal sulci.

A separate precentral medius sulcus may be present. Most frequently, it is derived from the upper part of the precentral inferior sulcus, or the posterior part of the horizontal ramus. The precentral superior sulcus may give rise to the superior frontal sulcus. A posterior ramus of the precentral superior sulcus is sometimes present and may appear as an extension of the superior frontal sulcus. A superior precentral sulcus may cut (12%) or reach (14%) the superomedial border of the frontal lobe, but in most cases (74%) it fails to reach that border.

Figura della scheda «Precentral Sulcus», da Anatomy Atlases

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Riferimenti dell’opera originale

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  • Sperino, G. (1901) Decrizione morfologica dell'encefalo del Prof. Carlo Giacomini. Int. Monatsschrift. Anatomie and Physiology 18:313-386.
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Anatomical classification

Systems:
Nervous system

Content provenance

Adaptation

Adaptation of «Precentral Sulcus — Illustrated Encyclopedia of Human Anatomic Variation: Opus I: Muscular System» by Ronald A. Bergman, Adel K. Afifi, Ryosuke Miyauchi. Source: https://www.anatomyatlases.org/AnatomicVariants/NervousSystem/Text/PrecentralSulcus.shtml Original work distributed under the CC BY-NC-SA 4.0 licence (https://creativecommons.org/licenses/by-nc-sa/4.0/deed.it). Adaptation by Redazione AIVA. Changes from the original: Testo originale inglese riprodotto integralmente e riorganizzato nel formato scheda del portale (sintesi, testo, riferimenti), senza modificarne le affermazioni. La traduzione italiana non è ancora stata eseguita, e la pagina lo dichiara. Le figure non sono state copiate: sono collegate alla pagina d’origine. This publication is not approved or endorsed by the authors of the original work.

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