Macrophotographs of selected sections of 7 days old chick embryos treated with various doses of permethrin (a: control(0ppm), b: 5ppm, c: 10ppm, d-e: 20ppm) Labels:nc: neurocoel, wm: white matter, gm: gray matter, Dg: dorsal root ganglion, N: notochord, da: dorsal aorta, m: mesonephros, s: spinal cord, int: intestine, sb: spina bifida, dvc: disrupted vertebral column, ds: disrupted spinal cord, dvo: disrupted visceral organs (Hematoxylinand Eosin:4x).