1. Sadler TW (2009) Langman’s medical embryology, 11th edn. Lippincott Williams & Wilkins, Philadelphia, p 225
2. Clemente CD (1997) Anatomy: a regional atlas of the human body, 4th edn. Lippincott Williams & Wilkins, Philadelphia, pp 160–171
3. Fathi AH, Soltanian H, Saber AA (2012) Surgical anatomy and morphologic variations of umbilical structures. Am Surg 78:540–544
4. O’Dey DM, Akabogu C, Bozkurt OA et al (2010) Perforator vessel anatomy of the papilla umbilicalis: topography and importance for reconstructive abdominal wall surgery. Langenbecks Arch Surg 395:1121–1127
5. Iida A, Yamaguchi A (2009) Single port laparoscopic cholecystectomy through the minimum navel incision from the bottom to the lower edge. J Jpn Soc Endosc Surg 15:531–536