All of a sudden, I had to find out today: what’s on the other side of a belly button? After viewing it for years as just a scar from where the umbilical cord used to be, I thought: well, while I was still a fetus – that cord must have lead somewhere? So it must have been attached to something on the inside?
I researched the subject RIGHT AWAY. I was too intrigued to find out – and sort of shocked that not only I have never known anything about it – I have never even thought to wonder about it!
Apparently, there are two arteries and one vein in the umbilical cord. The vein supplies the fetus with oxygenated, nutrient-rich blood from the placenta and then the fetal heart pumps “deoxygenated, nutrient-depleted” blood through the umbilical arteries back to the placenta.
Within the fetus, the umbilical vein continues towards the liver, where it splits into two. One of these vein branches joins a vein which carries blood into the liver. The second vein branch allows the majority of the incoming blood to bypass the liver and flow towards the heart. After the birth and cutting of the cord, the veins close up and degenerate into the round ligament of the liver.
The two umbilical arteries branch from the main pelvic arteries and pass on either side of the bladder. Part of each umbilical artery closes up and degenerates into some other ligaments (didn’t quite understand), while the remaining sections are retained as part of the circulatory system.
Huh. So that explains why my lady parts respond to the stimulation of my belly button – they are connected!