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Central Sulcus
Precentral Sulcus
Superior Frontal Sulcus
Inferior Frontal Sulcus
Ascending Branch of Sylvian Fissure
Horizontal Branch of Sylvian Fissure
Lateral Orbital Sulcus
Frontomarginal Sulcus
Cingulate Sulcus
Paracentral Sulcus
Supraorbital Sulcus
Olfactory orbital sulcus
Sylvian Fissure Terminal Split
Sup. Temporal with Upper Branch
Inferior Temporal Sulcus
Occipito Temporal Sulcus
Collateral Sulcus
Transverse Temporal Sulcus
Circular Sulcus
Postcentral Sulcus
Intraparietal Sulcus
Occipito parietal Sulcus
Subparietal Sulcus
Calcarine Sulcus
Transverse Occipital Sulcus
Lateral Occipital Sulcus
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Horizontal Branch of Sylvian Fissure

 

The Horizontal Branch of the Sylvian Fissure (hbSF) separates the pars triangularis from the pars orbitalis, both sectors of the inferior frontal gyrus. It starts together with the abSF with which it may be linked. It runs posterior to anterior towards the descending segment of the IFS or the Lateral Orbital Sulcus which it rarely reaches.

The first point of the curve should be dropped posteriorly (3) followed by the anterior terminal point (4).

Parasagital slices can be of help to identify these two sulci (5). The two terminal branches form a V or Y , easily seen on parasagital slices as shown.

The combination of the pars opercularis and triangularis is usually called, in the left hemisphere, Broca's Area.