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[[File:lighterstill.jpg]][[File:Umblical-cord.jpg|right|frame]]
[[File:lighterstill.jpg]][[File:Umbilical-cord-200.jpg|right|frame]]
*[http://en.wikipedia.org/wiki/18th_century 1753]
*[http://en.wikipedia.org/wiki/18th_century 1753]
*2: a tethering or supply line (as for an astronaut outside a spacecraft or a diver underwater)
*2: a tethering or supply line (as for an astronaut outside a spacecraft or a diver underwater)
*3: a [[necessary]], [[supportive]], or nurturing link or [[connection]]
*3: a [[necessary]], [[supportive]], or nurturing link or [[connection]]
==Description==
==Description==
In placental [[mammals]], the '''umbilical cord''' (also called the birth cord or ''funiculus umbilicalis'') is a conduit between the developing [[embryo]] or fetus and the [[placenta]]. During prenatal development, the umbilical cord is [[physiologically]] and [[genetically]] part of the fetus and (in humans) normally contains two arteries (the [http://en.wikipedia.org/wiki/Umbilical_arteries umbilical arteries]) and one vein (the umbilical vein), buried within [http://en.wikipedia.org/wiki/Wharton%27s_jelly Wharton's jelly]. The umbilical vein supplies the fetus with oxygenated, nutrient-rich [[blood]] from the [[placenta]]. Conversely, the fetal heart pumps deoxygenated, nutrient-depleted blood through the umbilical arteries back to the placenta.[http://en.wikipedia.org/wiki/Umbilical_cord]
In placental [[mammals]], the '''umbilical cord''' (also called the birth cord or ''funiculus umbilicalis'') is a conduit between the developing [[embryo]] or fetus and the [[placenta]]. During prenatal development, the umbilical cord is [[physiologically]] and [[genetically]] part of the fetus and (in humans) normally contains two arteries (the [http://en.wikipedia.org/wiki/Umbilical_arteries umbilical arteries]) and one vein (the umbilical vein), buried within [http://en.wikipedia.org/wiki/Wharton%27s_jelly Wharton's jelly]. The umbilical vein supplies the fetus with oxygenated, nutrient-rich [[blood]] from the [[placenta]]. Conversely, the fetal heart pumps deoxygenated, nutrient-depleted blood through the umbilical arteries back to the placenta.[http://en.wikipedia.org/wiki/Umbilical_cord]