Chorion frondosum
Decidua basalis
Decidua vera
Yolk sac
500
600
800
950
Decidua capsularis
Amniotic membrane
Chorionic villi
Glisson's capsule
Maternal and fetal blood mix in the placenta
Site of exchange of gas and nutrients between mom and fetus
Fetal portion is 1/5 of total placental weight
Can overcompensate for inadequacies
Maternal portion formed from decidua basalis
Produces hormones to maintain pregnancy
Composed of fibrous connective tissue
Highly vascular structure
True
False
Movement of placenta in relation to internal os of cervix
As uterus grows, the placenta changes positions
Apparent change in position of placenta
Placenta covering the cervix
All of the above
Large fetal vessels
Fibrin deposits
Placental lakes
All of the above
~12mm
~15mm
~16mm
~18mm
~21mm
Grade 0
Grade 1
Grade 2
Grade 3
34
36
38
28
Linear densities extend to basal plate
Linear densities extend from chorionic plate but not reaching basal plate
Smooth without echogenic densities
Homogeneous placental tissue
Venous lake
Fibrin deposit
Placenta previa
Large fetal vessels
Hematoma
Either B or E
Either A or B
Placental lake will be hypoechoic
Impossible to distinguish
Placental lake will have slow blood flow
Fibrin deposit will be hyperechoic
Associated with placentomegaly
Best seen with an overfilled bladder
Placenta implants over or near internal os of cervix
All of the above
Multiparity
Advanced maternal age
Prior cesarean sections
All of the above
A and C
Premature delivery
Life-threatening maternal hemorrhage
Increased risk of placenta accreta
Increased risk of intraplacental lesions
Placenta previa
Placenta accreta
Succenturiate placenta
Circumvallate placeta
Placenta accreta
Complete placenta previa
Placenta percreta
Venous lakes
Succenturiate placenta
Partial placenta previa
Circumvallate placenta
Placenta previa
Placenta accreta
Succenturiate placenta
Placenta previa
Succenturiate placenta
Circumvallate placenta
Placenta accreta
True
False
Concealed abruptio placenta
External abruptio placenta
Partial or complete placenta previa
Subchorionic hemorrhage
Placenta percreta
Oxygenated blood from placenta to fetus
Deoxygenated blood from fetus to placenta
Deoxygenated blood from placenta to fetus
Oxygenated blood from fetus to placenta
Oxygenated blood
Deoxygenated blood
Both
Averate length 55 cm
Transports blood between fetus and fetal portion of placenta
2 arteries, 1 vein
Forms during first 2 weeks of gestation
Outer portion of cord is surrounded by Wharton's jelly
2 veins, 1 artery
Amnion covers umbilical cord
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