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The umbilical ring is a dense fibrous ring surrounding the umbilicus at birth. [1] At about the sixth week of embryological development , the midgut herniates through the umbilical ring; six weeks later it returns to the abdominal cavity and rotates around the superior mesenteric artery .
Parts of the adult navel include the "umbilical cord remnant" or "umbilical tip", which is the often protruding scar left by the detachment of the umbilical cord. This is located in the center of the navel, sometimes described as the belly button. Around the cord remnant is the "umbilical collar", formed by the dense fibrous umbilical ring ...
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 ...
The umbilicus (navel) is a defect in the linea alba through which foetal umbilical vessels pass before birth. [1] ... "Anatomy diagram: 03281.000-2".
The meeting of both axis at the center form the umbilical ring. Meanwhile, the endoderm migrates to the center of this cylinder. [citation needed] By the fourth week of gestation the umbilical ring is formed. During the 6th week the midgut rapidly grows from the endoderm which causes a herniation of the gut through the
Superiorly, the lateral umbilical fold ends where the vessels reach and enter the rectus sheath [1] at the arcuate line of rectus sheath; in spite of the name, the lateral umbilical folds do not extend as far superiorly as the umbilicus. [2] Inferiorly, it extends to just medial to the deep inguinal ring. [citation needed]
The yolk sac is a membranous sac attached to an embryo, formed by cells of the hypoblast layer of the bilaminar embryonic disc.This is alternatively called the umbilical vesicle by the Terminologia Embryologica (TE), though yolk sac is far more widely used.
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 ).
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