umbilical cord(redirected from chorda umbilicalis)
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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
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.
..... Click the link for more information. . 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
..... Click the link for more information. (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.
..... Click the link for more information. and other cancers. Cord blood has also been used to repair heart and other tissue defects in children with certain metabolic disorders.
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.