Vein connects with venule
AnastomosesAn anastomosis is a joining of two structures such as blood vessels. In the circulation these are called circulatory anastomoses, one of which is the join between an artery with a vein known as an  arteriovenous anastomosis. This connection which is highly muscular, enables venous blood to travel directly from an artery into a vein without having passed from a capillary bed.Abnormal connections can be present known as arteriovenous malformations. These are usually congenital and the connections are made from a tangle of capillaries.  A cerebral arteriovenous malformation is one that is located in the brain. An irregular connection between an artery and a vein is known as arteriovenous fistula.
A small specialised arteriovenous anastomosis known as a glomus body or organ serves to transfer heat in the fingers and toes. The small connection is surrounded by a capsule of thickened connective tissue. In the hands and feet there are a great number of glomera.
Vascular shuntA vascular shunt can also bypass the capillary bed and provide a route for blood supply directly to a collecting venule. This is achieved by a metarteriole that supplies around a hundred capillaries. At their junctions are precapillary sphincters that tightly regulate the flow of blood into the capillary bed. When all of the sphincters are closed blood can flow from a metarteriole into a thoroughfare channel and into a collecting venule bypassing the capillary bed.
OtherA communicating vein directly connects two parts of the same system such as the Giacomini vein that connects the (superficial) small saphenous vein with the (superficial) great saphenous vein. Peripheral veins carry blood from the limbs and hands and feet.
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