Embryology

Question 1

1. The first indication of gastrulation in the embryo is?

Answer 1

C. Formation of the primitive stream

Question 2

2. A 20-year-old woman presented to ER with severe abdominal pain on the right side with signs of internal bleeding, she missed her last menstrual period. Which of the following disorders must be included as an option in the diagnosis?

Answer 2

B. Ectopic tubal pregnancy.

Question 3

3. Which of the following must degenerate for blastocyst implantation to occur?

Answer 3

D. Zona pellucida

Question 4

4. During the later stages of pregnancy maternal blood is separated from fetal blood by the:

Answer 4

D. Syncytiotrophoblast and fetal endothelium

Question 5

5. At the beginning of week 3 of development (day 17), what is the composition of the embryonic disc?

Answer 5

C. Ectoderm, mesoderm, &endoderm

Question 6

6. The prechordal plate marks the site of the future:

Answer 6

C. Mouth

Question 7

7. A 28-year-old pregnant woman experiences repeated episodes of red vaginal bleeding at week 28, 32 & 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?

Answer 7

B. Placenta previa

Question 8

8. The maternal & fetal components of the placenta are?

Answer 8

C. Decidua basalis & villous chorion

Question 9

9. Which of the following best describes the placental components of dizygotic twins?

Answer 9

E. Two placentas, two amniotic sacs, two chorions

Question 10

The femur is derived from?

Answer 10

Lateral Plate Mesoderm

Question 11

Patterning and initial growth of the limbs primarily begins?

Answer 11

During weeks 4 - 8 of development

Question 12

A baby is born with webbing between fingers. What is the diagnosis?

Answer 12

Syndactyly

Question 13

During weeks 6 - 8 the upper limb will rotate

Answer 13

Laterally 90 degrees

Question 14

During weeks 6 - 8 the lower limb bud will rotate

Answer 14

Medially 90 degrees