fold

A doubling of anything upon itself. amniotic f. A folded edge of the double amniotic membrane, where it rises over and finally encloses the embryo. anterior axillary f. The f. formed by the pectoral is major in front of the axilla [B. N. A., plica axillar is anterior.] arytenoepiglottic f., aryteno-epiglottidean brane extendingf. Two fromf's the of mucous tops of mem the arytenoid cartilages to the lateral margins of the epiglottis, basirrhinal f. See basirrhinal gyrus, callosa f. See callosal gyrus, caudal f. That f. of the blastoderm which encloses the caudal and primitive cloacal parts of the alimentary canal in the embryo, cephalic f. A f. of all the layers of the blastoderm, including also a part of the alimentary canal and the rudimentary heart.