sphincter muscle of common bile duct n.
A smooth muscle sphincter at the terminal end of the common bile duct.
- Sphincter muscle of pancreatic duct
sphincter muscle of pancreatic duct n. A smooth muscle sphincter of the main pancreatic duct within the duodenal papilla.
- Sphincter muscle of pupil
sphincter muscle of pupil n. A ring of smooth muscle fibers surrounding the pupillary border of the iris.
- Sphincter muscle of pylorus
sphincter muscle of pylorus n. See pyloric sphincter.
- Sphincter muscle of urethra
sphincter muscle of urethra n. A muscle with origin from the ramus of the pubis, wih insertion with its fellow muscle in the median raphe behind and in front of the urethra, with nerve supply from the pudendal nerve, and whose action constricts the membranous urethra.