Exam 3: Basic Embryology

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

Explain how conjoined twins may occur.

The splanchnic mesoderm forms next to this layer.

Which of the following does not distinguish mesoderm from either endoderm or ectoderm?

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

By the end of week 3, the mesoderm has divided into the somites, intermediate mesoderm, and ________.

Mesenchyme would refer to ________ but not ________.

This develops into the brain and spinal cord.

The term bilaminar disc refers to the embryonic ________ and ________.

Use the diagram above to answer the following questions. -Which letter indicates the morula?

The epiblast develops a primitive streak during days 14-15, the initial cells that ingress through the primitive streak become this germ layer.

Neural crest cells are derived from this germ layer.