1. Department of Anatomy, Faculty of Medicine, Al-Azhar University, Cairo, Egypt
2. Department of Basic Medical Sciences, College of Medicine, Prince Sattam Bin Abdulaziz University, Al- Kharj, Kingdom of Saudi Arabia
3. Department of Histology and Cell Biology, Faculty of Medicine, Alexandria University, Alexandria, Egypt
4. Cytology and Histology, Department, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt
5. Anatomy and Embryology Department, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt