Brain – Main sulci and gyri
Mental Skills Required
Brain – Main sulci and gyri
Mental Skills Required
Brain – Main sulci and gyri
Mental Skills Required
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Sylvian fissure
Sylvian fissure is the most consistent anatomical landmark. It is located on the superolateral surface of the hemisphere and separates frontal and temporal lobe, it is also called the lateral sulcus or lateral fissure.
Anterior Sylvian point divides the Sylvian fissure in into two rami:
- the anterior ramus
- the posterior ramus
The Sylvian fissure is often exposed through the pterional approach. The dissection of this fissure allows reaching the MCA, carotid artery, optic nerve, etc.
Parts of the Sylvian fissure
Sylvian fissure
Sylvian fissure is the most consistent anatomical landmark. It is located on the superolateral surface of the hemisphere and separates frontal and temporal lobe, it is also called the lateral sulcus or lateral fissure.
Anterior Sylvian point divides the Sylvian fissure in into two rami:
- the anterior ramus
- the posterior ramus
The Sylvian fissure is often exposed through the pterional approach. The dissection of this fissure allows reaching the MCA, carotid artery, optic nerve, etc.
Parts of the Sylvian fissure
Sylvian fissure
Sylvian fissure is the most consistent anatomical landmark. It is located on the superolateral surface of the hemisphere and separates frontal and temporal lobe, it is also called the lateral sulcus or lateral fissure.
Anterior Sylvian point divides the Sylvian fissure in into two rami:
- the anterior ramus
- the posterior ramus
The Sylvian fissure is often exposed through the pterional approach. The dissection of this fissure allows reaching the MCA, carotid artery, optic nerve, etc.
Parts of the Sylvian fissure
Central sulcus
The fissure separating the frontal lobe from the parietal lobe, also called Rolandic fissure. It arises from the superior limit of the hemisphere and slides on the lateral surface following a flexuous course.
The final segment does not often cross the Sylvian fissure but intersects the superior segment of the circular sulcus of the insula. It is usually located 2–5 cm behind the coronal suture, and it can be divided in two anterior and posterior rami.
It is characterized by three curves. The superior and inferior curves shape an anteriorly directed convexity, whereas the middle curve forms a concavity.
Central sulcus
Central sulcus
The fissure separating the frontal lobe from the parietal lobe, also called Rolandic fissure. It arises from the superior limit of the hemisphere and slides on the lateral surface following a flexuous course.
The final segment does not often cross the Sylvian fissure but intersects the superior segment of the circular sulcus of the insula. It is usually located 2–5 cm behind the coronal suture, and it can be divided in two anterior and posterior rami.
It is characterized by three curves. The superior and inferior curves shape an anteriorly directed convexity, whereas the middle curve forms a concavity.
Parietooccipital sulcus
The vertical sulcus on the medial surface of the hemisphere dividing the parietal lobe from the occipital lobe (on the medial surface – the precuneus from the cuneus). It arises from the cuneate sulcus, delimiting the cuneus anteriorly and the precuneus posteriorly.
It runs behind the level of the splenium and may present numerous patterns: T- or Y-shape, straight, or ramified into more branches.
Parietooccipital sulcus
The vertical sulcus on the medial surface of the hemisphere dividing the parietal lobe from the occipital lobe (on the medial surface – the precuneus from the cuneus). It arises from the cuneate sulcus, delimiting the cuneus anteriorly and the precuneus posteriorly.
It runs behind the level of the splenium and may present numerous patterns: T- or Y-shape, straight, or ramified into more branches.
Parietooccipital sulcus
The vertical sulcus on the medial surface of the hemisphere dividing the parietal lobe from the occipital lobe (on the medial surface – the precuneus from the cuneus). It arises from the cuneate sulcus, delimiting the cuneus anteriorly and the precuneus posteriorly.
It runs behind the level of the splenium and may present numerous patterns: T- or Y-shape, straight, or ramified into more branches.
Preoccipital notch
Preoccipital notch
Preoccipital notch
Relationship between main sulci/fissures and the lobes
Relationship between main sulci/fissures and the lobes
Relationship between main sulci/fissures and the lobes
Interhemispheric fissure
Interhemispheric fissure
Interhemispheric fissure
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Supported by the European Union
This project has received funding from the Eropean Union's H2020 Research and Innovation Programme under grant agreement n.880895
Supported by the European Union
This project has received funding from the Eropean Union's H2020 Research and Innovation Programme under grant agreement n.880895
Supported by the European Union
This project has received funding from the Eropean Union’s H2020 Research and Innovation Programme under grant agreement n.880895
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