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plica; a thin margin curved back on itself, or doubling.
amniotic fold the folded edge of the amnion where it rises over and finally encloses the embryo.
aryepiglottic fold a fold of mucous membrane extending on each side between the lateral border of the epiglottis and the summit of the arytenoid cartilage.
circular f's the permanent transverse folds of the luminal surface of the small intestine.
costocolic fold a fold of peritoneum passing from the left colic flexure to the adjacent part of the diaphragm; called also phrenicocolic ligament.
gastric f's the series of folds in the mucous membrane of the stomach.
gluteal fold the crease separating the buttocks from the thigh.
head fold a fold of blastoderm at the cephalic end of the developing embryo.
interdigital fold the free border of the web connecting the bases of adjoining digits.
lacrimal fold a fold of mucous membrane at the lower opening of the nasolacrimal duct.
mucosal fold (mucous fold) a fold of mucous membrane.
nail fold the fold of palmar skin around the base and sides of the nail of a finger or toe.
neural fold one of the paired folds lying on either side of the neural plate that form the neural tube.
semilunar fold of conjunctiva a mucous fold at the medial angle of the eye.
serosal fold (serous fold) a fold of serous membrane.
spiral fold a spirally arranged elevation in the mucosa of the first part of the cystic duct.
tail fold a fold of the blastoderm at the caudal end of the developing embryo.
transverse f's three permanent transverse folds in the rectum.
ventricular fold (vestibular fold) a false vocal cord.
vestigial fold a pericardial fold enclosing the remnant of the embryonic left anterior cardinal vein.
vocal f's true vocal cords.
a ventral folding of the cephalic end of the embryonic disk, so that the brain lies rostrad to the mouth and pericardium.