What is a vitelline duct?

What is a 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].

How vitelline duct is formed?

A constriction in the yolk sac encloses a small part of yolk sac within the embryo, forming the primitive digestive tube. 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 week does the vitelline duct normally obliterate?

Generally, the duct fully obliterates (narrows and disappears) during the 5–6th week of fertilization age (9th week of gestational age), but a failure of the duct to close is termed a vitelline fistula. This results in discharge of meconium from the umbilicus.

What is a vitelline fistula?

Introduction. Combination vitelline fistula (VF) and omphalocele at birth is a rare congenital anomaly as a result disturbance in organogenesis with failure of normal return of intestines into the abdominal cavity and failed obliteration of the vitelline duct.

What happens to the 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 is the function of Vitelline membrane?

The vitelline membrane (VM) is a multilayered structure that protects and gives shape to the egg yolk and separates it from the egg white. Together with the chalaza, VM keeps the egg yolk in the central part of the egg, thereby preventing its integration with the shell membranes.

What is the function of vitelline gland?

Is vitelline duct in umbilical cord?

Early in fetal life, the intestine communicates with the yolk sac. By the fourth week, the opening has gradually narrowed to form a tubular structure known as thevitelline oromphalomesenteric duct. At the 7-mm stage, the vitelline duct normally atrophies and forms a fibrous cord connecting the umbilicus and bowel.

Where is the vitelline membrane?

The vitelline membrane is the transparent casing that encloses the yolk of the hen’s egg and separates it from the albumen. It consists of two major layers, the inner layer, which is laid down in the ovary, and the outer layer, which is secreted in the oviduct.

Is vitelline a membrane?

The vitelline membrane or vitelline envelope is a structure surrounding the outer surface of the plasma membrane of an ovum (the oolemma) or, in some animals (e.g., birds), the extracellular yolk and the oolemma….

Does vitelline duct become umbilical cord?

What is Omphalomesenteric duct remnant?

Cutaneous remnants of the duct occur in the skin of the umbilicus and consist of ectopic tissue resembling that of the gastrointestinal tract. These lesions are frequently accompanied by potentially serious internal anomalies and thus have considerable warning value.

What is vitellointestinal duct anomaly?

Abstract Background: Vitellointestinal duct (VID) or omphalomesenteric duct anomalies are secondary to the persistence of the embryonic vitelline duct, which normally obliterates by weeks 5–9 of intrauterine life.

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.

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 another name for the alimentary duct?

A duct of the pancreas leading into the pancreatic duct or the duodenum near the mouth of the common bile duct. Synonym: duct of Santorini alimentary duct An obsolete term for the thoracic duct. alveolar duct A branch of a respiratory bronchiole that leads directly to the alveolar sacs of the lungs. See: alveolusfor illus Bartholin duct