anulus urethralis
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anulus — SYN: ring (1). [L.] a. abdominalis SYN: deep inguinal ring. a. ciliaris SYN: ciliary body. a. conjunctivae [TA] SYN: conjunctival ring. a. femoralis [TA] SYN: femoral ring. a. fibrocartilagineus membranae tympani [TA] SYN: fibrocartilaginous ring … Medical dictionary
sphincter — A muscle that encircles a duct, tube, or orifice in such a way that its contraction constricts the lumen or orifice. SYN: musculus s. [TA], s. muscle [TA]. [G. sphinkter, a band or lace] s. of ampulla s. of hepatopancreatic ampulla. anatomic s.… … Medical dictionary
