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Superior sagittal sinus

Other Terms: Sinus sagittalis superior, Sinus sagittal supérieur

Description

The superior sagittal sinus occupies the convex border of the falx cerebri. It passes from the foramen cecum at the root of the frontal crest through the mesial groove on the inner surface of the calvarin. It deviates slightly to the right in the posterior part of its course. It runs to the internal occipital protuberance, to end in the sinus confluence. The superior sagittal sinus is triangular on section; the base is directed toward the calvaria. It is narrower in front, gradually increasing in width as it passes backward. Its lumen is crossed by a number of fibrous bands called Willis cords and arachnoid granulations are frequently found projecting into it. It receives veins from the scalp through the parietal foramina, from the diploe, the dura mater, and the hemispheres of the cerebrum. These veins, particularly those from the cerebrum, the superior cortical, run into the sinus from behind forward in the direction opposite to that in which the blood current passes. They pierce the wall of the sinus very obliquely. In the fetus, the sinus communicates with the veins of the nose by a small emissary vein which passes through the foramen cecum, but this seldom occurs in the adult. The superior sagittal sinus presents a variable number of lateral outgrowths or pouches, which have been named the lacunae laterals. It is into these that the arachnoid granulations project.

Latin

Sinus sagittalis superior

French

Sinus sagittal supérieur

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