| 释义 |
umbilical cord
umbilical cordn.1. a. Anatomy The flexible cordlike structure connecting a fetus at the abdomen with the placenta and containing two umbilical arteries and one vein that transport nourishment to the fetus and remove its wastes.b. Something likened to this structure; a source or means of support or sustenance: "All the umbilical cords of dependency still exist because the public wants them" (David A. Stockman).2. Aerospace a. Any of various external electrical lines or fluid tubes that supply a rocket before launch.b. The line that supplies an astronaut with oxygen and in some cases with communications while outside the spacecraft.umbilical cord n 1. (Anatomy) the long flexible tubelike structure connecting a fetus with the placenta: it provides a means of metabolic interchange with the mother 2. any flexible cord, tube, or cable used to transfer information, power, oxygen, etc, as between an astronaut walking in space and his or her spacecraft or a deep-sea diver and his or her craft umbil′ical cord`
n. 1. a cordlike structure connecting the fetus with the placenta during pregnancy, conveying nourishment from the mother and removing wastes. 2. a disconnectable cable or connection for servicing, operating, or testing equipment, as in a rocket or missile. 3. a strong line that supplies air, communications, etc. [1745–55] um·bil·i·cal cord (ŭm-bĭl′ĭ-kəl) The flexible cord-like structure connecting a fetus at the abdomen to the placenta. It contains blood vessels that supply nourishment to the fetus and remove its wastes.umbilical cordThe cord that joins a fetus to a placenta.Thesaurus| Noun | 1. |  umbilical cord - membranous duct connecting the fetus with the placentaumbilicalconceptus, fertilized egg, embryo - an animal organism in the early stages of growth and differentiation that in higher forms merge into fetal stages but in lower forms terminate in commencement of larval lifefetus, foetus - an unborn or unhatched vertebrate in the later stages of development showing the main recognizable features of the mature animalduct, epithelial duct, canal, channel - a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance; "the tear duct was obstructed"; "the alimentary canal"; "poison is released through a channel in the snake's fangs"funiculus - any of several body structure resembling a cordfetal membrane - any membrane that functions for the protection or nourishment or respiration or excretion of a developing fetusumbilical vein, vena umbilicalis - a vein in the umbilical cord; returns nutrient blood from the placenta to the fetus |
Translationsumbilical cord
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.
..... 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. 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 umbilical cord
cord [kord] any long, cylindrical, flexible structure; called also chord, chorda, and funiculus.spermatic cord the structure extending from the abdominal inguinal ring to the testis, comprising the pampiniform plexus, nerves, ductus deferens, testicular artery, and other vessels.spinal cord see spinal cord.tethered cord a congenital anomaly resulting from defective closure of the neural tube; the conus medullaris is abnormally low and tethered by a short, thickened filum terminale, fibrous bands, intradural lipoma, or some other intradural abnormality. Surgical correction in infancy or early childhood is necessary to prevent progressive neurological deficit in the lower limb and bladder dysfunction.umbilical cord see umbilical cord.vocal c's see vocal cords.
umbilical [um-bil´ĭ-kal] pertaining to the umbilicus.umbilical cord the structure that connects the fetus and placenta; it is the lifeline of the fetus in the uterus throughout pregnancy. About 2 weeks after conception, the umbilical cord and the placenta are sufficiently developed to begin their functions. Through two arteries and a vein in the cord, nourishment and oxygen pass from the blood vessels in the placenta to the fetus, and waste products pass from the fetus to the placenta. Soon after birth, the umbilical cord is clamped or tied and then cut. The part that is attached to the placenta, still in the uterus, is expelled with the placenta. The stump that remains attached to the baby's abdomen is about 2 inches (5 cm) long. After a few days it falls off naturally. Clamping the umbilical cord. Umbilical cord with umbilical vein and umbilical arteries. From McKinney, 2000.umbilical hernia protrusion of abdominal contents through the abdominal wall at the umbilicus, the defect in the abdominal wall and protruding intestine being covered with skin and subcutaneous tissue. Called also exomphalos and exumbilication.
During the growth of the fetus, the intestines grow more rapidly than the abdominal cavity. For a period, a portion of the intestines of the unborn child usually lies outside the abdomen in a sac within the umbilical cord. Normally, the intestines return to the abdomen, and the defect is closed by the time of birth. Occasionally the abdominal wall does not close solidly, and umbilical hernia results. This defect is more likely to be seen in premature infants and in girls rather than boys. It usually closes by itself. Coughing, crying, and straining temporarily cause the sac to enlarge, but the hernia never bursts and digestion is not affected. If the defect in the abdominal wall has not repaired itself by the time the child is 2 years old, surgery to correct the condition (herniorrhaphy) can then be performed.
Umbilical hernia should be distinguished from omphalocele, in which the intestines protrude directly into the umbilical cord and are covered only by a thin membrane. Omphalocele is a surgical emergency that must be treated immediately after birth.um·bil·i·cal cordthe definitive connecting stalk between the embryo or fetus and the placenta; at birth it is primarily composed of mucoid connective tissue (Wharton jelly) in which the umbilical vessels are embedded. Synonym(s): chorda umbilicalis, funiculus umbilicalis, funis (1) umbilical cordn. The flexible cordlike structure connecting a fetus at the navel with the placenta and containing two umbilical arteries and one vein that transport nourishment to the fetus and remove its wastes.infanticide Forensic medicine The active or semi-passive killing of a viable conceptus > 20 gestational wks, which breathes spontaneously. See Battered child syndrome, Child abuse. Cf Stillbirth. Infanticide, diagnosis of
'Hard' criteria • Comparison of gastric fluid composition with that of a toilet bowel-active drowning • Peural surfaces with petechiae Seen in induced suffocation, most significant when coupled with hematomas and petechiae on the mouth and epiglottis; the lingual frenulum may be torn and the lips bruised, indicating active attempts to suffocate infant. • Lungs Stillbirth lungs are not aerated and do not float • Edematous foam on nostrils An indicator of active breathing • Meconium Resuscitation of a true stillborn may push meconium into the perianal region, but extensive staining of the placenta and umbilical cord is due to antenatal stress 'Soft' criteria • Denial of pregnancy If the woman is obese or a dullard, she may not know she was pregnant • Rigor mortis A finding that is poorly appreciated in neonates • Impression of the body in soil, blood, or fomites, requiring diligent and timely scene investigation • Maceration of skin A finding typical of stillbirth • Putrefaction Stillborns do not putrefy as they have sterile bowels • Umbilical cord A cut cord indicates active intervention-time undetermined; an intact cord is consistent with stillbirth • Determination of age Viability, most fetuses born before 18 wks of gestation die despite resuscitative efforts, age is determined by skeletal dating, antenatal studies corroborating fetal death, eg Spaulding sign of in utero death characterized by overlapping cranial bones
um·bil·i·cal cord (ŭm-bil'i-kăl kōrd) The definitive connecting stalk between the embryo or fetus and the placenta; at birth it is primarily composed of mucoid connective tissue (Wharton jelly) in which the umbilical vessels are embedded.
Synonym(s): funiculus umbilicalis [TA] , funis (1) .  UMBILICAL CORDumbilical cordThe attachment connecting the fetus with the placenta. It contains two arteries and one vein surrounded by a gelatinous substance (Wharton's jelly). The umbilical arteries carry blood from the fetus to the placenta, where nutrients are obtained and carbon dioxide and oxygen are exchanged; this oxygenated blood returns to the fetus through the umbilical vein. See: illustrationThe umbilical cord is surgically severed after the birth of the child. To give the infant a better blood supply, the cord should not be cut or tied until the umbilical vessels have ceased pulsating. However, in preterm infants, the cord should be clamped and cut before pulsation ceases to avoid maternal-newborn transfusion and reduce the risk of hypovolemia, polycythemia, and hyperbilirubinemia. The stump of the severed cord atrophies and leaves a depression on the abdomen of the child (the navel, umbilicus, or belly button). See also: cordumbilical cord The nutritional, hormonal and immunological link between the mother and the fetus during pregnancy. The umbilical cord arises from the PLACENTA and enters the fetus at the site of the future navel. It carries two arteries and a vein that connect to the fetal circulation.umbilical cord the cord that joins the embryo of placental mammals to the PLACENTA (1) consisting of two arteries and one vein supported by connective tissue. The cord is usually severed at birth, the part connected to the baby degenerating, leaving a scar, the navel.Umbilical cordThe blood vessels that allow the developing baby to receive nutrition and oxygen from its mother; the blood vessels also eliminate the baby's waste products. One end of the umbilical cord is attached to the placenta and the other end is attached to the baby's belly button (umbilicus).Mentioned in: Placenta Previa, Placental AbruptionFinancialSeeCordumbilical cord
Related to umbilical cord: placenta, umbilical cord bloodSynonyms for umbilical cordnoun membranous duct connecting the fetus with the placentaSynonymsRelated Words- conceptus
- fertilized egg
- embryo
- fetus
- foetus
- duct
- epithelial duct
- canal
- channel
- funiculus
- fetal membrane
- umbilical vein
- vena umbilicalis
|