| plicae circulares | The numerous folds of the mucous membrane of the small intestine, running transversely for about two-thirds of the circumference of the gut. Synonym: circular folds, Kerckring's folds, Kerckring's valves, valvulae conniventes. (05 Mar 2000) |
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| fibrae circulares | The circular fibres of the ciliary muscle. Synonym: fibrae circulares, Muller's fibres, Muller's muscle, Rouget's muscle. (05 Mar 2000) |