| sacrovaginal fold | The lower part of the sacrouterine fold. Synonym: plica rectovaginalis. (05 Mar 2000) |
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| sacrovesical fold | The fold of peritoneum in the male that bounds the rectovesical pouch laterally. Synonym: rectovesical fold. (05 Mar 2000) |
| salpingopalatine fold | 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) |
| salpingopharyngeal fold | 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) |
| Schultze's fold | A fold of amniotic membrane enclosing the yolk stalk and extending from the point of insertion of the umbilical cord to the yolk sac; in reptiles and birds it is the reflected edge of the amnion where it folds over to cover the embryo during early development. Synonym: Schultze's fold. (05 Mar 2000) |
| semilunar conjunctival fold | 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) |
| semilunar fold | 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) |
| semilunar fold of colon | One of the folds of the wall of the colon between sacculations. Synonym: plica sigmoidea, semilunar fold of colon. (05 Mar 2000) |
| spiral fold of cystic duct | 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) |
| nail fold | The fold of skin overlapping the lateral and proximal margins of the nail. Synonym: vallum unguis, wall of nail. (05 Mar 2000) |
| nasojugal fold | A shallow groove in the skin that extends downward and laterally from the medial canthus. (05 Mar 2000) |
| stapedial fold | 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) |
| Nelaton's fold | See: transverse rectal folds. (05 Mar 2000) |
| neural fold | A crease that forms in the neural plate during neurulation. (18 Nov 1997) |
| sublingual fold | 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) |