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sphe·noi·dal em·is·sar·y fo·ra·men[TA]
a minute inconstant foramen in the greater wing of the sphenoid bone, anterior and medial to the foramen ovale, transmitting a small emissary vein from the cavernous sinus.
an aperture in the greater wing of the sphenoid bone, through which a small vein passes from the cavernous sinus. Also called foramen of Vesalius.