| plica palpebronasalis | A fold of skin that comes down across the inner angle of the eye. The epicanthal fold is more common in children with Down syndrome and other birth defects than normal children and so is of value in diagnosis. Although some dictionaries state that this eye fold is found in peoples of Asian origin, this is not true. The normal Asian eyefold is continuous with the lower edge of the upper eyelid and actually appears distinctly different than a true epicanthal fold. (12 Dec 1998) |
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| plica paraduodenalis | A sickle-shaped fold of peritoneum sometimes found arching between the left side of the duodenojejunal flexure and the medial border of the left kidney; its right free edge contains the ascending branch of the left colic artery and inferior mesenteric vein; forms anterior boundary of the paraduodenal recess. See: paraduodenal recess. Synonym: plica paraduodenalis, Treitz's arch. (05 Mar 2000) |
| plica rectouterina | A fold of peritoneum, containing the rectouterine muscle, passing from the sacrum to the base of the broad ligament on either side, forming the lateral boundary of the rectouterine (Douglas') pouch. Synonym: plica rectouterina, Douglas' fold, Jarjavay's ligament, Petit's ligament, rectouterine fold, uterosacral ligament. (05 Mar 2000) |
| plica rectovaginalis | The lower part of the sacrouterine fold. Synonym: plica rectovaginalis. (05 Mar 2000) |
| plica salpingopalatina | 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 salpingopharyngea | A ridge of mucous membrane extending from the lower end of the tubal elevation along the wall of the pharynx overlying the salpingopharyngeus muscle. Synonym: plica salpingopharyngea. (05 Mar 2000) |
| plica semilunaris | The curved fold connecting the palatoglossal arch and palatopharyngeal arch above the supratonsillar fossa; it always contains lymphoid tissue. Synonym: plica semilunaris. (05 Mar 2000) |
| plica semilunaris conjunctivae | 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) |
| plica semilunaris of colon | One of the folds of the wall of the colon between sacculations. Synonym: plica sigmoidea, semilunar fold of colon. (05 Mar 2000) |
| 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) |
| 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) |