Exam 4: Development

The region indicated by the letter E is the _____.

The ectoderm of the embryonic disc eventually gives rise to all nervous tissue, the epidermis of the skin, and epithelium of the oral and nasal cavities.

About 8 days after fertilization, the trophoblast develops into two layers in the region of contact between the blastocyst and endometrium. The layer known as the syncytiotrophoblast secretes enzymes that assist the embryo in penetrating the endometrium.

Place the following events in the correct order and briefly define each: embryonic development, implantation, fetal period, fertilization, labor, cleavage, placental development.

On the diagram, 1 is pointing to

The heartbeat of a developing embryo can be detected during the _____ week of pregnancy.

The period of development called the embryonic period is _____ in length.

Describe the production and functions of the amniotic fluid.

On the diagram, 4 is pointing to

Which of the following is the most important event during the third week of development?

The _____ is the portion of the blastocyst that develops into the embryo.

List the stages of labor and briefly describe the events that occur in each stage.

The syncytiotrophoblast and the cytotrophoblast are two layers of the endometrium that are involved in placenta formation.

Over the course of pregnancy, the uterus increases from its pre-pregnancy mass primarily due to growth of the _____ layer.

Each somite differentiates into three regions: a myotome, a dermatome, and a sclerotome. Which of the following statements is incorrect?

Which of the following structures actually implants into the endometrium of the uterus?

The _____ _________is the clear glycoprotein layer between the corona radiata and the oocyte's plasma membrane.

During the _____ month of pregnancy, hair appears on the fetal head and articulations begin to form.

Name the structure indicated by the pointer on structure E. Into what does this develop?

Dizygotic (fraternal) twins result from