| plica semilunaris of eye | The semilunar fold formed by the palpebral conjunctiva at the medial angle of the eye, a fold of the conjunctival mucous membrane found in many animals; normally partially hidden in the medial canthus of the eye when at rest, it may be extended to cover part or all of the cornea in a winking-like action to clean the cornea, as in birds. Synonym: membrana nictitans, nictitating membrane, palpebra III, palpebra tertia, third eyelid. Synonym: plica lunata, plica semilunaris of eye, semilunar conjunctival fold. (05 Mar 2000) |
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| plica sigmoidea | One of the folds of the wall of the colon between sacculations. Synonym: plica sigmoidea, semilunar fold of colon. (05 Mar 2000) |
| plica spiralis ductus cystici | A series of crescentic folds of mucous membrane in the upper part of the cystic duct, arranged in a somewhat spiral manner. Synonym: plica spiralis ductus cystici, Amussat's valve, Heister's valve, spiral valve of cystic duct, valvula spiralis. (05 Mar 2000) |
| plica stapedis | A reflection of the delicate mucous membrane from the posterior wall of the tympanic cavity that covers the stapes. Synonym: plica stapedis. (05 Mar 2000) |
| plica sublingualis | An elevation in the floor of the mouth beneath the tongue, on either side, marking the site of the sublingual gland. Synonym: plica sublingualis. (05 Mar 2000) |
| plica synovialis | A projection from the synovial membrane of a joint extending toward or between the two articular surfaces. Synonym: plica synovialis. (05 Mar 2000) |
| plica synovialis infrapatellaris | A fold of synovial membrane extending from below the level of the articular surface of the patella to the anterior part of the intercondylar fossa. Synonym: plica synovialis infrapatellaris, plica synovialis patellaris. (05 Mar 2000) |
| plica synovialis patellaris | A fold of synovial membrane extending from below the level of the articular surface of the patella to the anterior part of the intercondylar fossa. Synonym: plica synovialis infrapatellaris, plica synovialis patellaris. (05 Mar 2000) |
| plica triangularis | A fold of mucous membrane anterior to the palatine tonsil arising from the palatoglossal arch. Synonym: plica triangularis. (05 Mar 2000) |
| plica tubopalatina | A ridge of mucous membrane passing from the anterior border of the opening of the auditory (eustachian) tube to the palate. Synonym: plica salpingopalatina, plica tubopalatina. (05 Mar 2000) |
| plica umbilicalis lateralis | The ridge on the peritoneal surface of the anterior abdominal wall formed by the inferior epigastric vessels. Synonym: plica umbilicalis lateralis, epigastric fold, plica epigastrica. (05 Mar 2000) |
| plica umbilicalis media | A fold of peritoneum on the anterior wall of the abdomen covering the urachus, or remains of the allantoic stalk. Synonym: plica umbilicalis mediana, middle umbilical fold, plica umbilicalis media, plica urachi, urachal fold. (05 Mar 2000) |
| plica umbilicalis medialis | A fold of peritoneum on the lower part of the anterior abdominal wall that covers the obliterated umbilical artery on either side of the urachus. Synonym: plica umbilicalis medialis, plica hypogastrica. (05 Mar 2000) |
| plica umbilicalis mediana | A fold of peritoneum on the anterior wall of the abdomen covering the urachus, or remains of the allantoic stalk. Synonym: plica umbilicalis mediana, middle umbilical fold, plica umbilicalis media, plica urachi, urachal fold. (05 Mar 2000) |
| plica urachi | A fold of peritoneum on the anterior wall of the abdomen covering the urachus, or remains of the allantoic stalk. Synonym: plica umbilicalis mediana, middle umbilical fold, plica umbilicalis media, plica urachi, urachal fold. (05 Mar 2000) |