Many people wrongly assume that the veins of the head do not contain one-way valves like other veins of the circulatory system.

It is a common misconception that the veins of the head do not contain one-way valves like other veins of the circulatory system.

The vein contains mostly cassiterite, a mineral that contains among other elements tin, zinc, and silver.

This vein (stratum) contains ore beds, and is encased in crystalline limestone.

The vein containing most of the mineralisation contains a fluorite-barite mineralisation below the uranium mineralised parts.

It has been stated that this vein may contain a mother lode of gold farther to the east and upstream.

The veins of the brain have very thin walls and contain no valves.

His veins should have contained only dust, Alidore mused, avoiding the ruined face that tilted upward toward the sky.

The veins also contain special one-way valves that aid the return of blood to the heart and lungs.

The veins contain pitchblende, autunite and uranophane, with accessory marcasite and barite.