| sphincter of pancreatic duct | Smooth muscle sphincter of the main pancreatic duct immediately proximal to the hepatoduodenal, ampulla. Synonym: musculus sphincter ductus pancreatici, pancreatic sphincter, sphincter muscle of pancreatic duct. (05 Mar 2000) |
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| sphincter of the pharyngeal isthmus | A constant band of the superior pharyngeal constrictor muscle which sweeps posteriorly from the anterolateral part of the superior surface of the palatine aponeurosis. It creates a visible ridge when the superior constrictor is contracted, meeting the elevated soft palate to seal off the pharyngeal isthmus during swallowing. Synonym: pharyngeal ridge, sphincter of the pharyngeal isthmus, velopharyngeal sphincter. (05 Mar 2000) |
| sphincter of third portion of duodenum | A physiological sphincter supposedly located at the horizontal (inferior) portion of the duodenum. (05 Mar 2000) |
| sphincter oris | <anatomy, muscle> Origin, by nasolabial band from septum of the nose, by superior incisive bundle from incisor fossa of maxilla, by inferior incisive bundle from lower jaw each side of symphysis; insertion, fibres surround mouth between skin and mucous membrane of lips and cheeks, and are blended with other muscles; action, closes lips; nerve supply, facial. Synonym: musculus orbicularis oris, musculus sphincter oris, orbicular muscle of mouth, sphincter oris. (05 Mar 2000) |
| sphincter pupillae | A ring of smooth muscle fibres surrounding the pupillary border of the iris. Synonym: musculus sphincter pupillae, sphincter muscle of pupil. (05 Mar 2000) |
| sphincter urethrae | Origin, ramus of pubis; insertion, with fellow in median raphe behind and in front of urethra; action, constricts membranous urethra; nerve supply, pudendal. Synonym: musculus sphincter urethrae, external urethral sphincter, Guthrie's muscle, musculus compressor urethrae, musculus constrictor urethrae, musculus sphincter urethrae membranaceae, sphincter muscle of urethra, Wilson's muscle. (05 Mar 2000) |
| sphincter vaginae | <anatomy> In the male: origin, the perineal membrane fascia on the dorsum of the bulb of the penis; insertion, central tendon of the perineum and the median raphe on the free surface of the bulb; action, constricts bulbous urethra when attempting to expel last drops following urination, or spasmodically with ejaculation to expel semen. In the female: origin, the dorsum of the clitoris, the corpus cavernosum, and the perineal membrane; insertion, central tendon of the perineum; action, acts as a weak sphincter of the vagina; when developed, is a part of "cross-member musculature" of pelvic floor which resists prolapse of pelvic viscera. Nerve supply, pudendal (deep perineal branch). Synonym: musculus bulbospongiosus, musculus bulbocavernosus, musculus ejaculator seminis, musculus sphincter vaginae, sphincter vaginae. (05 Mar 2000) |
| sphincter vesicae | The complete collar of smooth muscle cells of the neck of the urinary bladder which extend distally to surround the preprostatic sportion of the male urethra. There is not a comparable structure in the neck of the femoral bladder; the internal urethral sphincter may exist to prevent reflux of semen into bladder. Synonym: annulus urethralis, internal urethral sphincter, musculus sphincter vesicae, preprostate urethral sphincter, proximal urethral sphincter, sphincter muscle of urinary bladder. (05 Mar 2000) |
| sphincter vesicae biliaris | The sphincter of the gallbladder, at the transition between the neck of the gallbladder and the cystic duct. (05 Mar 2000) |
| sphincteral | Relating to a sphincter. Synonym: sphincterial, sphincteric. (05 Mar 2000) |
| sphincteralgia | Pain in the sphincter ani muscles. Origin: sphincter + G. Algos, pain (05 Mar 2000) |
| sphincterectomy | 1. Excision of a portion of the pupillary border of the iris. 2. Dissecting away any sphincter muscle. Origin: sphincter + G. Ektome, excision (05 Mar 2000) |
| sphincteric | Relating to a sphincter. Synonym: sphincterial, sphincteric. (05 Mar 2000) |
| sphincterismus | Spasmodic contraction of the sphincter ani muscles. (05 Mar 2000) |
| sphincteritis | Inflammation of any sphincter. (05 Mar 2000) |
| sphincterotomy |
Surgical cutting/incision of a sphincter; incision of the internal sphincter of the anus, used in the treatment of anal fissure.
출처: www.colonrectal.org/patientinfo/definitions/defini...
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| spherical aberration |
Light passing through a convex lens will be brought to different focus depending upon whether the light passes through near the center of the lens or closer to the periphery. Lens designers strive to correct this kind of zonal aberration to bring peripheral and near-central rays to a common focus.
출처: www.vistek.ca/glossary/default.asp
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| spherical |
shaped like a globe or sphere
출처: encarta.msn.com/dictionary_1861675591/global.html
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| sphagnum moss |
Various mosses native to bogs are sphagnum. Often used for the lining of hanging baskets and for air layering. (See Air Layering)
출처: www.boldweb.com/greenweb/glossary.htm
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| sphere |
A three-dimensional figure with all points in space a fixed distance from a given point, called the center.
출처: www.bagatrix.net/glossary/math_glossary_s.htm
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