emissarium


em·is·sar·y vein

[TA] one of the channels of communication between the venous sinuses of the dura mater and the veins of the diploë and the scalp.
See also: condylar emissary vein, mastoid emissary vein, occipital emissary vein, parietal emissary vein. Synonym(s): vena emissaria [TA], emissarium, emissary (2)