emissary vein

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Related to Emissary veins: cavernous sinus
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Noun1.emissary vein - one of several connecting veins in the scalp and head that drain blood from sinuses in the dura mater to veins outside the skull
vein, vena, venous blood vessel - a blood vessel that carries blood from the capillaries toward the heart; "all veins except the pulmonary vein carry unaerated blood"
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It also receives blood from diploic, meningeal and emissary veins. Deep cerebral veins drain the deeper parts of cerebral hemispheres into straight sinus, lateral and sigmoid sinuses.
The risk of interruption of the emissary veins on the lower posterior border of the mastoid is lower with this modification.
The anatomic configuration in the patient presented certainly enabled the techniques employed and will not be reproducible in all patients with Budd-Chiari syndrome, particularly those with difficult to cannulate caudate or emissary veins, tortuous intrahepatic venous collaterals or excessive distances from dominant intrahepatic veins to the native hepatic vein confluence.
(4,5) Loose areolar tissue includes a vast number of emissary veins that connects superficial scalp veins and subdural venous sinuses.
Karlin & Robinson (1984) reported that due to the communication between the pterygoid venous plexus and the cavernous sinus through the emissary veins (venosum), thrombophlebitis and/or septic thrombosis may occur as the result of suppurating processes in the orbital regions, from the paranasal sinuses, from the upper half of the face and, rarely, from dental infections.
Alpha-1 blockage leads to direct arteriolar dilatation, which results in an increased blood flow and decreased outflow secondary to effacement and subsequent obstruction of emissary veins. Furthermore, alpha-2 receptor antagonism is thought to lead to the release of a nitric oxide-like substance, which is a potent smooth muscle relaxant (15).
The infection may spread from the face via the facial venous plexus, which connects to the valveless emissary veins into the cranium.
Septicemia and cavernous sinus involvement can develop by way of the emissary veins that drain the nasal septum.
This occurs when emissary veins are damaged and blood accumulates in the potential space between the galea aponeurotica (epicranial aponeurosis) and the periosteum of the skull (pericraniaum).