Exam 3: Basic Embryology

The mesoderm located deep to the neural tube that forms the kidneys and the gonads is the

Which characteristic is not true of a blastocyst?

A teratogen is

Implantation of the blastocyst into the uterine lining takes about

The urinary bladder is derived from which embryonic layer?

Describe the types of tissues that make up the endoderm, ectoderm, and mesoderm, and explain how these tissues relate to their developmental processes.

Quickening occurs (mother feels fetus moving).

This is the most common preventable cause of mental retardation in the United States.

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

A transverse section through the 24-day embryo, dorsal to ventral, would first contact the

The epiblast gives rise to the three primary germ layers.

The ectoderm develops into the epithelium of the skin, whereas this layer gives rise to the epithelial lining of the gut tube.

Which of the following is not a primary germ layer?

The process of neurulation begins as the ectoderm dorsal to the ________ thickens into the neural plate.

Sensory nerve cells, the skin's pigment-producing cells, and the facial bones all derive from

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

The inner cell mass will form the embryo, and the trophoblast will form the placenta.

Identical (monozygotic) twins are

Conception occurs in the

The fetal period is the longer and later of the prenatal growth periods.