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The umbilicus (navel) is a defect in the linea alba through which foetal umbilical vessels pass before birth. [1] The linea alba is formed by the union of aponeuroses (of the muscles of the anterior abdominal wall [ 2 ] ) that collectively make up the rectus sheath .
The umbilical region is one of the nine regions of the abdomen. It is the region that surrounds the area around the umbilicus and is placed approximately halfway between the xiphoid process and the pubic symphysis .
In the human embryo, the vitelline duct, also known as the vitellointestinal duct, [1] the yolk stalk, [1] the omphaloenteric duct, [1] or the omphalomesenteric duct, [1] is a long narrow tube that joins the yolk sac to the midgut lumen of the developing fetus. [2]
The median umbilical ligament was jokingly referred to as "Xander's ligament" in a YouTube video published by Dr. Alexander R. Toftness (aka. ARTexplains on YouTube), and this name was subsequently used on Wikipedia for a short time. [6] This term was later used in a paper published in Mayo Clinic Proceedings.
one median umbilical fold on the median umbilical ligament (which in turn, contains the urachus) two medial umbilical folds on the occluded umbilical artery;
The amniotic membrane and its contents form the umbilical cord that connects the embryo and the placenta. [3] [4] The root of the connecting stalk contains the allantois as a diverticulum of hindgut endoderm along with umbilical vessels. [5] [2] Anomalies are usually referred to as body stalk anomalies and occur in approximately 1 in 15,000 ...
As the umbilical vessels are obliterated and the infant starts breathing at birth, the source of oxygen changes from the placenta to the lungs. This major trigger will facilitate the transformation from fetal to postnatal circulation in many ways. First, the ductus venosus was previously kept open by the blood flow from the umbilical vein.
The medial umbilical ligament, cord of umbilical artery, or obliterated umbilical artery is a paired structure found in human anatomy. It is on the deep surface of the anterior abdominal wall , and is covered by the medial umbilical folds ( plicae umbilicales mediales ).