Exam 3: Basic Embryology

The ribs and vertebrae form from this primary germ layer.

In human embryos, the yolk sac is important because it

Which of the following appears latest in human development?

Approximately percent of all children have some birth defect.

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

Which of the following is endodermal in origin?

The outer membrane of the amniotic sac is called the amnion.

The intermediate mesoderm forms the .

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

This layer will give rise to the bones, ligaments and joints of the embryonic limbs.

Mesenchyme would refer to but not .

Eyes open and lungs develop.

The embryonic ultimately form the arms and legs of the adult. 91)

Conjoined twins occur as a result of

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

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

Neural crest cells are derived from this germ layer.

This develops into the lining of the gastrointestinal tract.

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

The splanchnic mesoderm forms next to this layer.