extrinsic sphincter
ex·trin·sic sphinc·ter
a sphincter provided by circular muscular fibers extraneous to the organ.
Farlex Partner Medical Dictionary © Farlex 2012
ex·trin·sic sphinc·ter
(eks-trin'zik sfingk'tĕr)A sphincter provided by circular muscular fibers extraneous to the organ.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012