ANATOMÍA DEL LÓBULO PARIETAL - Surcos, circunvoluciones y pliegues de paso

Anatomy of the Parietal Lobe

Overview of the Parietal Lobe

• The parietal lobe is situated anteriorly to the occipital lobe, inferiorly to the frontal lobe, and posteriorly to the temporal lobe.

• It is separated from these lobes by specific fissures: Rolando (central), Silviana (lateral), and external perpendicular fissures.

Structure and Features

• The interparietal or intraparietal sulcus originates at the angle formed by the Rolando and Silviana fissures, extending upward and backward.

• This sulcus creates a concave border that delineates various gyri within the parietal lobe.

Gyri of the Parietal Lobe

• The ascending parietal gyrus, also known as post-central gyrus, is bounded superiorly by Silviana fissure and anteriorly by Rolando fissure; it relates closely to Brodmann area 4 (motor area).

• This gyrus consists of three segments: superior (head), middle (body), and inferior (foot). A notable feature includes connections with frontal areas via fronto-parietal sulci.

Additional Structures

• The superior parietal gyrus lies above the intraparietal sulcus, containing several important anatomical features such as superior occipital passage folds.

• The inferior parietal gyrus is divided into two segments by Jensen's sulcus: supramarginal gyrus (upper) and angular gyrus (lower). These structures are crucial for sensory integration.

Functional Relationships

• The parietal lobe has significant connections with motor pathways including pyramidal tracts for voluntary movement, as well as sensory pathways for processing tactile information.