Gynaecology & Obstetrics The theorized function of the Hyl anastomosis is equalization of which of the following? A Oxygen diffusion across villi B Osmotic gradient across fetal membranes C Pressure gradient between spiral aeries D Pressure gradient between umbilical aeries 💡 Explanation The theorized function of the Hyl anastomosis is equalization of which of the following? ✓ Correct Answer: D. Pressure gradient between umbilical aeries