Exam 3: Basic Embryology

If a mutation occurs in the hypoblast cells of a bilaminar embryo, one might expect birth defects to be present in the

Conjoined twins occur as a result of

Thalidomide, once used to alleviate morning sickness in pregnant women, resulted in

The amniotic sac is derived from the epiblast, while the placenta develops from the

Implantation of the blastocyst on the uterine lining takes about

The embryonic notochord will eventually be replaced by the developing ________, leaving only remnants that persist as the nucleus pulposus of intervertebral discs.

Blood vessels and the heart arise from this primary germ layer.

Premature birth is one that occurs 38 weeks after conception.

Spina bifida results when the neural tube fails to close in the head.

Another name for birth defect is

Sex can be determined from the genitals.

The primary germ layer that ultimately forms the serous membranes of the peritoneum is

The intermediate mesoderm forms the ________.

Figure 3.1 Use the diagram above to answer the following questions. -Which letter indicates the blastocyst?

Production of surfactant begins during week 22-26 of the gestational period. Premature infants born after week 26 will

Based on the proportions of the adult body, the 3-month fetus still shows disproportionately large

The developing embryo, about 72 hours after fertilization, is called the zygote.

What embryonic epiblast cells that remain on the surface of the trilaminar disc are ultimately called.

Conception occurs in the

Splanchnic mesoderm gives rise to components of the cardiovascular system, including ________.