Fissura perpendicularis externa, also known as the external perpendicular fissure, is a prominent anatomical landmark found in the human brain. It is one of the main features that characterizes the cerebral cortex, specifically the frontal lobe.
The fissura perpendicularis externa is located on the lateral surface of the brain, separating the superior and middle frontal gyri. It begins at the superior border of the brain, near the midline, posterior to the frontal pole, and extends laterally towards the Sylvian fissure. As the name suggests, it runs perpendicular to the longitudinal fissure which divides the brain into its left and right hemispheres.
This external perpendicular fissure is crucial in providing structural and functional organization to the brain. It serves as a distinct boundary between the frontal lobes, contributing to the identification and localization of various cortical regions. The fissure's depth, length, and course can vary among individuals, and its characteristics are studied in neuroanatomy to understand brain architecture and functions.
The fissura perpendicularis externa plays a crucial role in neurological and psychiatric imaging techniques such as magnetic resonance imaging (MRI) and computed tomography (CT). By identifying and delineating the fissure, clinicians and researchers can accurately map brain regions, aiding in the diagnosis and treatment of various neurological disorders.
In summary, the fissura perpendicularis externa is a prominent cortical feature of the frontal lobe, serving as a crucial anatomical landmark in identifying and understanding brain organization.
