上矢状・下矢状静脈洞の解剖

Venous Anatomy of the Superior and Inferior Sagittal Sinuses

Point

・上矢状静脈洞（SSS）には，上大脳静脈系の皮質静脈が架橋静脈を介して流入するほかに，外側にあるlateral venous lacunaを介して硬膜・板間静脈が流入する．

・架橋静脈は，硬膜貫通部から直接SSSに流入するものと，dural venous channel（venous lake）を介するものがあり，これらはlateral venous lacunaの下方からSSS外側に流入する．

・SSSのvariationsは，胎児期のsagittal plexusとmarginal sinusの正中での融合および消退の程度によって生じる．

　The superior sagittal sinus（SSS）is contained within the dura, which consists of the dura propria and osteal dura at the junction of the falx cerebri, in addition to the attachment of the falx to the cranial vault. The SSS extends anteriorly from the foramen cecum and posteriorly to the torcular Herophili. The superior cerebral veins flow into the SSS, coursing under the lateral venous lacunae via bridging veins. Most of the bridging veins reach the dura and empty directly into the SSS. However, some are attached to the dural or existed in it for some distance before their sinus entrance. The venous structures of the junctional zone between the bridging vein and the SSS existed in the dura are referred to as dural venous channels. The SSS communicates with the lateral venous lacunae connecting the meningeal and diploic veins, as well as the emissary veins. These anatomical variations of the SSS are defined by the embryological processes of fusion and withdrawal of the sagittal plexus and marginal sinus.