noun. 1. a junction or opening between 2 organs, cavities, or constructions which are usually apart from one another. 2. a variant path developed by the branching out of a primary circuit. Anastomes are housed in blood and lymphatic vessels, as well as nerves. Arterial anastomoses provide the brain with assistance by making sure blood continues to move whenever a path becomes blocked due to the blowing out of a blood vessel or a clot
ANASTOMOSIS: "Blood vessels have many anastomosis pathways."