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Embryogenesis and Fetal Development

Which of the following is assumed when using the first day of the last menstrual period for dating?

a. The patient has a 36-day cycle.

b. The patient became pregnant on that day.

c. The patient ovulated approximately two weeks later.

d. The first day of the last menstrual period was implantation bleeding.

What is the accuracy of an ultrasound measurement shown below?

a. ±2–3 days

b. ±5–7 days

c. ±8–10 days

d. ±12–14 days

Approximately how long is each trimester of pregnancy?

a. 12 weeks

b. 13 weeks

c. 14 weeks

d. 15 weeks

When is a conceptus termed an embryo?

a. Third week from the last menstrual period

b. Fifth week from the last menstrual period

c. Sixth week from the last menstrual period

d. Twelfth week from the last menstrual period

A 20-year-old primigravida presents to your office to start prenatal care. She reports having an ultrasound performed last week at another facility. She shows you an ultrasound image which is provided below. Interested in science, the patient would like to know what is happening to the fetus at this gestational age. Which of the following statements would be incorrect?

a. The fetus has fingers and toes.

b. Skins and nails are developing.

c. The eyes are moving, and there is blinking.

d. The fetus is beginning to make spontaneous movements.

A 29-year-old multigravida ...

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