A "Potential Anastomosis" seen in
Labial branch of facial aery
Intercostal aery
Coronary aery
Aerial arcades of mesentery
Aerial anastomosis is the communication between the aeries, or branches of aeries. It may be actual or potential. Actual Aerial Anastomosis: In actual aerial anastomosis the aeries meet end to end. For example, palmar arches, plantar arch, circle of Willis, intestinal arcades, labial branches of facial aeries. Potential Aerial Anastomosis: In potential aerial anastomosis the communication takes place between the terminal aerioles. Such communications can dilate only gradually for collateral circulation. Therefore on sudden occlusion of a main aery, the anastomosis may fail to compensate the loss. The examples are seen in the coronary aeries and the coical branches of cerebral aeries. Ref - Medscape.com
Thorax