pure metals that crystallize from hot water solutions underground often form veins.
Veins form when rock collides with another rock and the rock that collide pushes the other rock untill only a little bit of it is left
Veins form when mineral constituents carried by an aqueous solution within the rock mass are deposited through precipitation.
Varicose veins form when blood pools in the veins.
The two veins that form hepatic portal vein are the splenic vein and the superior mesenteric vein. These veins usually receive blood from the inferior mesenteric, gastric, and cystic veins.
brachiocephalic veins
The deep veins of the forearm are the venæ comitantes of the radial and ulnar veins and constitute respectively the upward continuations of the deep and superficial volar venous arches; they unite in front of the elbow to form the brachial veins. The radial veins are smaller than the ulnar and receive the dorsal metacarpal veins. The ulnar veins receive tributaries from the deep volar venous arches and communicate with the superficial veins at the wrist; near the elbow they receive the volar and dorsal interosseous veins and send a large communicating branch (profunda vein) to the vena mediana cubiti.
The capillary beds in the tissues, where they connect the arterioles and venules together, which then fuse to form the arteries and veins.
Spider veins are a form of varicose veins. They are ugly, aren't they? Staying active can help prevent them. In short, don't get a desk job -- go to the gym often.
Right and left brachiocephalic veins
Blood collects into small veins that in turn merge to form trabecular veins
fringing veins
The common iliac veins
venules
Venules are the microscopic vessels that continue from the capillaries and merge to form veins. Veins carry blood back to the atria, leading to the heart...