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].

Is the vitelline duct the umbilical cord?

Umbilical cord development begins in the embryologic period around week 3 with the formation of the connecting stalk. By week 7, the umbilical cord has fully formed, composed of the connecting stalk, vitelline duct, and umbilical vessels surrounding the amniotic membrane.

What is vitelline yolk sac 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 vitelline gland?

vitellaria, often known as the vitelline glands or yolk glands. The cells of the vitellaria form yolk and eggshell components. In some groups, particularly those that live primarily in water or have an aqueous phase in the life cycle, the eggshell consists of a hardened protein known as sclerotin, or…

What happens vitelline duct?

The vitelline duct acts as a communicating tract between the embryonic yolk sac and its primitive midgut during early human development. 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.

What happens to the vitelline duct?

What is the function of yolk sac?

The yolk sac functions as an absorptive epithelium for nutrient uptake and secretion as well as the origin of the first blood cells. In human and non-human primates, the allantois is a small diverticulum, which is part of the umbilical cord, connects to the bladder and acts as a temporary store for foetal excretions.

What is the function of the Omphalomesenteric duct?

The omphalomesenteric duct (vitelline duct) connects the yolk sac to the small intestine. This duct obliterates when the embryo is about 6 weeks old. Complete failure of the duct to obliterate results in a fistula from the ileum to the umbilicus (vitelline fistula).

What is vitelline vesicle?

Connection of the yolk sac to the embryonic digestive system is gradually reduced to a small tube called the vitelline duct (sometimes called the umbilical vesicle). …

What is the function of the vitelline duct?

[edit on Wikidata] 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 the difference between allantoic duct and omphalomesenteric duct?

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.

What is the function of the allantois in mammals?

In mammals. The allantois becomes the urachus which connects the fetal bladder to the yolk sac. The urachus removes nitrogenous waste from the fetal bladder. The allantois is vestigial and may regress, yet the homologous blood vessels persist as the umbilical arteries and veins connecting the embryo with the placenta.

What is the clinical significance of a patent allantois?

Clinical significance. During the third week of development, the allantois protrudes into the area of the urogenital sinus. Between the 5th and 7th week of development, the allantois will become the urachus, a duct between the bladder and the yolk sac. A patent allantois can result in urachal cyst.