Embryonic Development Week 2-4 I,II
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Embryonic Development Week 2-4 I,II

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Questions and Answers

Which of the following is a phase in the development of the primitive uteroplacental circulation?

Extraembryonic Mesoderm Formation

Which cellular contributions are involved in the formation of the bilaminar embryonic disc?

Embryonic Mesoderm

What is the process of gastrulation?

Formation of the Primitive Streak

How does the primordial cardiovascular system develop?

<p>Blood Islands and Heart Formation</p> Signup and view all the answers

Which process marks the beginning of morphogenesis in the embryonic disc?

<p>Gastrulation</p> Signup and view all the answers

During gastrulation, which germ layers are generated?

<p>Ectoderm, mesoderm, and endoderm</p> Signup and view all the answers

What is the precursor to the notochord?

<p>Notochordal process</p> Signup and view all the answers

What is the process involved in the formation of the neural plate and neural tube?

<p>Neurulation</p> Signup and view all the answers

Which structure marks the cranial end of the embryo?

<p>Prechordal plate</p> Signup and view all the answers

What is the function of human chorionic gonadotropin (hCG) in pregnancy?

<p>Stimulates progesterone by the corpus luteum</p> Signup and view all the answers

What can high levels of hCG indicate during pregnancy?

<p>Multiple pregnancies</p> Signup and view all the answers

What is a hydatidiform mole?

<p>A fluid-filled sac or mass of tissue that has no viable embryo</p> Signup and view all the answers

During embryonic development, which tissue gives rise to most of the cardiovascular system, including the heart?

<p>Splanchnic mesoderm</p> Signup and view all the answers

During embryonic development, what is the name of the tissue formed by the splanchnic mesoderm and the underlying endoderm?

<p>Splanchnopleure</p> Signup and view all the answers

What is the process of formation of blood vessels de novo from hemangioblasts called?

<p>Vasculogenesis</p> Signup and view all the answers

What is the process of formation of new blood vessels from pre-existing vasculature called?

<p>Angiogenesis</p> Signup and view all the answers

Which of the following is responsible for bringing together the paired heart tubes to form the single heart tube in its final orientation?

<p>Folding in the sagittal plane</p> Signup and view all the answers

Which of the following contributes cells that form most of the outflow tract and right ventricle in heart formation?

<p>Secondary heart field</p> Signup and view all the answers

At approximately what day do blood islands begin forming?

<p>Day 17</p> Signup and view all the answers

When are blood cells made by the embryo?

<p>Weeks 5-6</p> Signup and view all the answers

What is the primary heart field also known as?

<p>Cardiogenic plate</p> Signup and view all the answers

What is the primary heart field responsible for forming?

<p>Left ventricle</p> Signup and view all the answers

Which structure gives rise to the CNS - the brain and spinal cord?

<p>Neural plate</p> Signup and view all the answers

What is the process involved in the formation of the neural plate and neural folds and closure of these folds to form the neural tube?

<p>Neurulation</p> Signup and view all the answers

What structure forms the ganglia, Schwann cells, enteric nervous system, chromaffin cells, parafollicular C cells, and melanocytes?

<p>Neural crest cells</p> Signup and view all the answers

What does the paraxial mesoderm differentiate into during development?

<p>Dermatome, myotome, and sclerotome</p> Signup and view all the answers

Which of the following is true about the different cell lineages in the developing mammalian embryo?

<p>The endoderm differentiates into mesoderm</p> Signup and view all the answers

What are the two layers that the embryoblast differentiates into during the second week of development?

<p>Epiblast and hypoblast</p> Signup and view all the answers

What is the function of human chorionic gonadotropin (hCG) produced by the syncytiotrophoblast?

<p>Maintains the activity of the corpus luteum</p> Signup and view all the answers

What is the source of the extraembryonic mesoderm that surrounds the amnion and yolk sac?

<p>Primitive streak</p> Signup and view all the answers

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