1. The nephridium projects into the main venous sinus in the animal's foot. 2. Most cases of cerebral venous sinus thrombosis are due to hypercoagulability. 3. From there the infection may spread to the dural venous sinuses . 4. Some authors have theorized that a persistent venous sinus reflects an arrest in embryologic development. 5. Of particular concern are large veins, called venous sinuses , that carry blood away from the brain. 6. From the arterial sinuses bathing the tissues, it drains into the venous sinus , and thus flows past the nephridium. 7. They pierce the arachnoid matter and the meningeal layer in the dura and drain into the cranial venous sinuses . 8. But this pacemaker activity is actually made by a group of cells that derive from the sinoatrial right venous sinus . 9. Imaging including angiography may be indicated to identify dural venous sinus thrombosis as a cause of intracranial hypertension and optic atrophy. 10. And the venous sinuses are fragile; if one is torn, a child can bleed to death in less than a minute.
Mobile