umbilical cord


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Related to umbilical cord: placenta, umbilical cord blood

umbilical cord

(ŭmbĭl`ĭkəl), cordlike structure about 22 in. (56 cm) long in the pregnant human female, extending from the abdominal wall of the fetus to the placentaplacenta
or afterbirth,
organ that develops in the uterus during pregnancy. It is a unique characteristic of the higher (or placental) mammals. In humans it is a thick mass, about 7 in. (18 cm) in diameter, liberally supplied with blood vessels.
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. Its chief function is to carry nourishment and oxygen from the placenta to the fetus and return waste products to the placenta from the fetus. It consists of a continuation of the membrane covering the fetus and encloses a mucoid jelly through which one vein carries oxygenated blood and two arteries carry unoxygenated blood. After birth, the cord is clamped off and cut. It is sometimes abnormal in length and may break prematurely or form loops or knots, which may asphyxiate the fetus. The stump of the cord that is left attached to the infant withers and drops off, leaving the scar known as the navel.

Because umbilical cord blood is especially rich in stem cellsstem cells,
unspecialized human or animal cells that can produce mature specialized body cells and at the same time replicate themselves. Embryonic stem cells are derived from a blastocyst (the blastula typical of placental mammals; see embryo), which is very young embryo that
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 (cells that give rise to red blood cells and lymphocytes) some parents choose to save it in private cord blood banks in case of future need as a transplant alternative to bone marrow, but in many diseases treated with stem cells such autologous transplants are contraindicated. Studies have shown that people not related to the donor (genetically mismatched) can benefit from transplants of umbilical cord blood in combating leukemialeukemia
, cancerous disorder of the blood-forming tissues (bone marrow, lymphatics, liver, spleen) characterized by excessive production of immature or mature leukocytes (white blood cells; see blood) and consequently a crowding-out of red blood cells and platelets.
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 and other cancers. Cord blood has also been used to repair heart and other tissue defects in children with certain metabolic disorders.

Umbilical Cord

 

an anatomical formation in humans and other placental mammals that connects the fetus with the placenta, and—through the placenta—with the mother. The umbilical cord consists mainly of gelatinous tissue known as Wharton’s jelly, through which the two umbilical arteries and the umbilical vein pass. When the fetus is full-term, the umbilical cordis 1–1.5 cm thick and about 50 cm long.

What does it mean when you dream about an umbilical cord?

An umbilical cord in a dream can represent a source of nourishment, but it often carries less pleasant connotations of dependency, or a crippling emotional tie to one’s mother.

umbilical cord

[əm′bil·ə·kəl ‚kȯrd]
(aerospace engineering)
Any of the servicing electrical or fluid lines between the ground or a tower and an uprighted rocket vehicle before the launch. Also known as umbilical.
(embryology)
The long, cylindrical structure containing the umbilical arteries and vein, and connecting the fetus with the placenta.

umbilical cord

the long flexible tubelike structure connecting a fetus with the placenta: it provides a means of metabolic interchange with the mother
References in periodicals archive ?
When that donor failed, I was so disheartened but doctors then told me about the umbilical cords," said Mrs Slater, who lives with husband David.
Sanchez-Ramos JR, Neural cells derived from adult bone marrow and umbilical cord blood.
Two studies published in the November 25 issue of the New England Journal of Medicine confirm that umbilical cord stem cells are very effective in treating leukemia.
But their potential in adults has been less clear, because a single umbilical cord contains only about one-tenth as many blood stem cells as the typical bone marrow transplant does.
Many parents have opted to save the blood from their baby's umbilical cord and have been sending it to privately run facilities elsewhere in North America, a fact that bodes well for the feasibility of this aspect of the foundation, MacKinnon says.
Then, rather than being allowed to learn to breathe in the gentle way described above, your umbilical cord may have been immediately severed, converting your first breath from a natural occurrence to a matter of life and death.
They measured these compounds in 10 randomly selected umbilical cord plasma samples from each of three regions in Canada.
A substance believed to be an endocrine disrupter was found in the umbilical cord of a newborn baby in a study carried out by the Environment Ministry, the ministry said Wednesday.
The stem cell may have been derived from an embryo, resulting in the death of the embryo, or it may have been derived from a child or adult, or from blood in the umbilical cord, with no harm to anyone.
We studied fetal and maternal thiol plasma concentrations in normal pregnancies to determine reference concentrations for cysteine, homocysteine, and cysteinylglycine in arterial and venous umbilical cord plasma to gain insight into maternal-fetal thiol interactions.

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