sphincter

(sfingk’ter) (L.; Gr. σφιγκτήρ binder]. A ring-like muscle which closes a natural orifice. See muscles, table of. 8. a@’ni. See under muscles, table of. Henle’s 8., the muscular fibers which surround the prostatic urethra. Hyrtl’s 8., an incomplete band of muscular fibers in the rectum a few inches above the anus. Nélat on’s 8., an occasional and often incomplete belt of muscle-fibers of the rectum at the level of the prostate. O’Beirne’s s., a band at the junction of the colon and rectum. 8. oc’uli, the orbicularis palpebra rum muscle. 8. O’ris, the orbicularis or is muscle. pre pyloric s., a band of muscle fibers in the stomach-wall above the pyloric sphincter. pyloric s., a thickening of the muscular wall of the stomach around the pyloric opening. third s., Houston's valve. 8s. ure’thre. See under muscles, table of. 8. vagi’nsa, the bulb oca ver nos us musciz. vasculolymphatic nervous 8., a supposed contracting band of fibers at the margin of the pupil. s. vesi’c . See under muscles, table of.