Precapillary arteriovenous anastomoses. "Thoroughfare channels" in the brain.
D000293:Adolescent; D000328:Adult; D000368:Aged; D000818:Animals; D001163:Arteriovenous Anastomosis / Q000033:anatomy & histology*; D001921:Brain / Q000098:blood supply*; D002196:Capillaries / Q000033:anatomy & histology; D002531:Cerebellum / Q000098:blood supply; D002560:Cerebrovascular Circulation; D002648:Child; D004285:Dogs; D006801:Humans; D008875:Middle Aged; D010784:Photomicrography; D013194:Staining and Labeling