What is the remnant of the vitelline duct?
The omphalomesenteric (vitelline) duct is a normal component of fetal development. It connects the fetal intestine to the yolk sac. When these structures persist in a newborn, they are called omphalomesenteric duct remnants.
What is the remnant of the allantois?
The urachus is a fibrous remnant of the allantois, a canal that drains the urinary bladder of the fetus that joins and runs within the umbilical cord. The fibrous remnant lies in the space of Retzius, between the transverse fascia anteriorly and the peritoneum posteriorly.
Where can we see the remnant of allantois?
Allantoic duct remnant is present in the proximal portion of 15% of umbilical cords.
What is omphalomesenteric duct remnant?
The omphalomesenteric duct is an embryologic connection between the digestive tract and yolk sac, which typically involutes by the time of birth. Failure of the obliteration process can result in omphalomesenteric duct remnants.
What is the purpose of the vitelline duct?
The vitelline duct (VD) is an embryonic structure providing communication from the yolk sac to the midgut during fetal development [1]. Normally, it obliterates spontaneously and separates from the intestine between approximately the 5th and 9th weeks of gestation [2].
Where is the vitelline duct located?
In the human embryo, the vitelline duct, also known as the vitellointestinal duct, the yolk stalk, the omphaloenteric duct, or the omphalomesenteric duct, is a long narrow tube that joins the yolk sac to the midgut lumen of the developing fetus.
What does allantois develop into?
The embryonic allantois becomes the fetal urachus, which connects the fetal bladder (developed from cloaca) to the yolk sac. The urachus removes nitrogenous waste from the fetal bladder.
What is allantois and chorion?
The allantois is characteristic of reptiles, birds, and mammals, and lies between two other extraembryonic membranes: the amnion, the innermost layer, which covers and protects the embryo; and the chorion, which is the outermost layer, housing the embryo and all the other extraembryonic membranes.
What does the allantois become?
What is the remnant of the umbilical vein?
The ligamentum teres is the remnant of the umbilical vein working throughout fetal life.
What is the function of Vitellointestinal duct?
What is the vitelline duct?
In the human embryo, the vitelline duct, also known as the vitellointestinal duct, the yolk stalk, the omphaloenteric duct, or the omphalomesenteric duct, is a long narrow tube that joins the yolk sac to the midgut lumen of the developing fetus.
What is allantoic duct remnants?
Allantoic duct remnants are usually located between the umbilical arteries of the proximal portion of the umbilical cord and are rarely accompanied by smooth muscle Epithelium of the duct is cuboidal to flat and generally is of transitional type although mucin producing epithelium can be found
When is the vitelline duct obliterated during pregnancy?
During the eighth week of gestation, the vitelline duct is normally obliterated as the placenta replaces the yolk sac as the primary source for fetal nutrition.7 A Meckel’s diverticulum develops when incomplete obliteration of the vitelline duct occurs between the fifth and seventh week of gestation.
What is the difference between allantoic duct and urachus?
Allantois is the primitive extraembryonic urinary bladder and will eventually become the urachus, which connects the fetal bladder to the yolk sac; the allantoic duct originates as an outpouching of the yolk sac Omphalomesenteric (vitelline) duct connects the midgut lumen with the yolk sac in the developing fetus