Chapter 56 The Umbilical Cord Flashcards
The umbilical cord forms during the first ______ weeks of gestation.
5
1st trimester umbilical length is approximately the same size as the _____.
CRL
The intestines grow at a faster rat than the abdomen; they herniate at approx. _____ weeks.
10-12
The umbilical cord is covered by the _______ membrane.
amniotic
The umbilical cord is surrounded by a homogeneous substance called _______ jelly.
Warton’s
The diameter of the cord usually measures _____cm. The normal lengthof the cord is ____cm.
1-2, 40-60
The umbilical arteries arise from the fetal ________arteries.
internal iliac
The umbilical vein is formed by the confluence of the _________ of the placenta, with its primary purpose to transport oxygenated blood back to the fetus.
chorionic veins
The umbilical vein enters the umbilicus and joins the _________ as it courses through the liver.
left portal vein
A short umbilical cord measures less than ______
35cm
The normal cord may coil as many as ____ times, usually to the ____ and near the fetal insertion site.
40, left
A long umbilical cord measures longer than ___
80cm
Cystic masses are usually _________ or _______ in origin.
omphalomensenteric, allantoic
Omphalomesenteric cysts affects females more frequently than males at a rate of ____
5:3
Occlusions of one or more vessels of the umbilical cord; primarily it occurs in the umbilical vein
.
The mortality rate of knots in the cord is ____%
8-11
When blood vessels are longer than the cord
false knot
when the cord implants into the edge of the placenta near the internal os instead of the middle.
Battledore placenta
Umbilical cord vessels crossing the internal os of the cervix. Mortality ranging from _____% for vaginal delivery .
60-70
When the cord lies alongside the presenting part.
Occult prolapse
The ____ umbilical artery is absent a slightly higher percentage than the ____.
left, right
An artery-to artery difference of more than 50%
hypoplatic umbilical artery
Single umbilical arteries typically have a transverse diameter of greater than ____ mm
4
Focal dilation of the umbilical vein is nearly always _______ but extrahepatic in location.
intra-abdominal
Persistence of right portal vein rather than normal left-sided portal vein.
Persistent intrahepatic right portal vein
At ______ weeks gest. age paired umbilical veins carry blood from the placenta to the primitive heart.
5-6
