[Siome additional findings on the fine structure of human retinal arterioles. I. Sphincter-like structure at the site of side-arm branching].
D000293:Adolescent; D000328:Adult; D001158:Arteries / Q000166:cytology*; D002648:Child; D006801:Humans; D008854:Microscopy, Electron; D012171:Retinal Vessels / Q000166:cytology*