Ovule

(p'-vul). In biology: (a) A small ovum or animal egg; a young or rudimentary seed. O., External Migration of, the transfer of an ovule from the right ovary to the left oviduct, or from the left ovary to the right oviduct. O., Membrana granulosa of, the layer of stratified follicular epithelium lining the cavity of the ovisac. The prominence formed at one side is called the cumulus ovigerus, or discus pro liger us. O., Migration of, the transfer of the ovule from the ovary to the oviduct. O. of Naboth, one of the small resulting from obstruction of the ducts of the glands of the cervix of the uterus. O., Polar Cells of, certain cells thrown off upon the surface of the vitellus of the unimpregnated ovum. O., or Cell, Primordial, one of the primitive ovules in the substance of the ovary. O., Tunica granulosa of, the layer surrounding the ovum.