title: A technique for illuminating early chick embryos in ovo with a glass rod as a light guide.
abstract: A glass rod mounted on a microscope condenser acts as a light guide through the yolk of a fertile hen's egg. Two apertures must first be made in the shell: the one below covered with plastic film which seals around the rod; the one above covered with a glass coverslip to allow microscopic observation of the embryo.
mesh_terms: D000818:Animals; D002642:Chick Embryo / Q000166:cytology*; D005898:Glass; D006652:Histological Techniques; D008029:Lighting / Q000379:methods*; D008853:Microscopy