The Developmental Toxicity of Thymus schimperi Essential Oil in Rat Embryos and Fetuses

Figure 2

A 12-day-old rat embryos showing various organs of primordia. (a) An embryo enclosed inside the intact yolk sac (YS) with vitelline vasculature surrounding it (VV); (b) yolk sac-free embryo, separated from the surrounding blood vessels, revealing the heart (H), telencephalon (TC), mesencephalon (MS), and rhombencephalon (RC); and (c) brachial bars (BB), forelimb bud (FL), somites (SM), and caudal limb bud (CL).