1. Department of Anatomy and Embryology, Faculty of Veterinary Medicine University of Sadat City Sadat City Egypt
2. Department of Histology and Cytology, Faculty of Veterinary Medicine Damanhour University Damanhour Egypt
3. Department of Forensic Medicine and Toxicology, Faculty of Veterinary Medicine Benha University Toukh Egypt
4. Department of Cytology and Histology, Faculty of Veterinary Medicine Suez Canal University Ismailia Egypt
5. Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences Texas A&M University College Station TX USA