Exam 3: Basic Embryology

Male and female fetuses can first be distinguished by their genitalia at

Defects in the development of the neural tube may be linked to inadequate dietary intake of .

Explain how conjoined twins may occur.

The middlemost embryonic germ layer to develop is

Division of cells in a zygote is called

This develops into the epidermis of the skin.

Mucus-producing glands of the respiratory tract arise from this layer.

A(n) abortion is one in which the fetus dies and is naturally aborted.

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

This develops into the brain and spinal cord.

The most common cause of mental retardation in the United States is

The dermis of the dorsal body region is derived from somites. However, the dermis of the ventral body region is derived from

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

Somatic mesoderm gives rise to all of the following except

Which of the following adult structures derives from neural crest?

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

Another name for birth defect is

The sex of the fetus can be determined externally by approximately month .

The three primary germ layers are the endoderm, myotome, and exoderm.

Somites differentiate into