Embryology Questions Flashcards
The first indication of gastrulation in the embryo is?
Formation of the primitive streak
A 20-year-old woman presented to the ER with severe abdominal pain on the right side with signs of internal bleeding. She missed her last menstrual period. What disorder must be included as an option in the diagnosis?
Ectopic tubal pregnancy
What must degenerate for blastocyst implantation to occur?
Zona pellucida
During the later stages of pregnancy maternal blood is separated from fetal blood by:
Syncytiotrophoblast and fetal endothelium
At the beginning of week 3 of development (day 17), what is the composition of the embryonic disc?
Ectoderm, mesoderm, and endoderm
The prechordal plate marks the site of the future…
Mouth
A 28-year-old pregnant woman experiences repeated episodes of red vaginal bleeding at week 28, 32 and 34 of pregnancy. The bleeding spontaneously subsided each time. Use of ultrasound shows that the placenta is located in the lower right portion of the uterus over the internal os. What is the diagnosis?
Placenta Previa
The maternal and fetal components of the placenta are?
Decidua basalis and villous chorion
What best describes the placental components of dizygotic twins?
Two placentas; two amniotic sacs; two chorions
The femur is derived from
Lateral Plate Mesoderm
Patterning and initial growth of the limbs primarily begins when?
During weeks 4-8 of development
A baby is born with webbing between her fingers. The doctor stated that this minor defect can be easily corrected surgically. The most likely diagnosis is…
Syndactyly
During weeks 6-8, the upper limb will rotate…
Laterally 90 degrees
During weeks 6-8, the lower limb bud will rotate…
Medially 90 degrees
