1. Department of Anatomy and Embryology, Faculty of Medicine Ain Shams University Cairo Egypt
2. Anatomy Unit, Department of Basic Medical Sciences Unaizah College of Medicine and Medical Sciences, Qassim University Buraydah Saudi Arabia
3. Histology Department, Faculty of Medicine Menoufia University Menoufia Egypt
4. Histology Unit, Department of Basic Medical Sciences Unaizah College of Medicine and Medical Sciences, Qassim University Buraydah Saudi Arabia
5. Department of Human Anatomy and Embryology Faculty of Medicine, Assiut University Assiut Egypt
6. Department of Pharmacology & Toxicology, Faculty of Pharmacy Al‐Azhar University Assiut Egypt