Straight Sinus (Brain, Sagittal Section), Lateral View

Description

Running in the midline at the junction of the falx cerebri and tentorium cerebelli, the straight sinus (sinus rectus) appears as a blue dural venous channel on a lateral view of a sagittal brain section. Anteriorly it lies posterior to the splenium of the corpus callosum and superior to the quadrigeminal cistern region, then courses posteriorly and slightly inferiorly toward the confluence of sinuses (confluens sinuum) at the internal occipital protuberance. The cerebrum occupies the superior and anterior field, while the cerebellum sits posterior and inferior, separated by the tentorial plane that forms the straight sinus’ inferior boundary. Color coding typically distinguishes accompanying venous spaces from adjacent arterial structures and the yellow spinal and cranial nerve elements descending through the brainstem into the spinal cord. A lateral sagittal section is the teaching workhorse for dural venous sinus anatomy because it makes the falx-tentorium junction readable in one glance and clarifies why the straight sinus is the key outflow tract for the deep cerebral venous system via the great cerebral vein (of Galen). This relationship matters in arteriovenous malformations and dural arteriovenous fistulas near the falcotentorial region, where venous hypertension can propagate into the internal cerebral veins, producing thalamic edema or hemorrhage. It also anchors preoperative orientation for posterior interhemispheric and supracerebellar infratentorial approaches, where the surgeon works near the vein of Galen complex and must respect the straight sinus and its drainage into the confluence. Neuroanatomy and neuroradiology courses use this view to correlate MR venography and CT venography with gross anatomy, including the confluence and nearby tentorial landmarks. It also fits operative atlases, patient education on venous sinus thrombosis, and lectures on intracranial pressure pathways and CSF absorption in relation to dural venous channels. Anatomical accuracy verified by SciePro's Medical Advisory Board.