fold

(fold). Plica, a ridge; a margin apparently formed by the doubling back of a lamina. For the various folds, not here deimed, see plica. gen'ital f., one of two integumentary folds on either side of the genital tubercle in the embryo, from which are developed the labia minor a or the walls of the urethra in the male, hypoblas'tic f., a folding over of the hypoblast giving origin to the notochord neu'ral f., one of the upgrowths of ectoderm forming the neural canal, oper-' cular f., ti ue forming an adhesion between the tonsil and the anterior pillar of the fauces. rec'tal f., rectal valve, plica* transversal is recti [BNA]. rectoves'ical f., excavatio recto vesical is [BNA]. ventric'ular f., false vocal cord, plica* ventricular is [BNA]. vestig'ial f., lig amentum venEB cavae sinistra.