Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 39m
3. Energy & Cell Processes10h 8m
4. Tissues & Histology10h 3m
5. Integumentary System2h 28m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System3h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

28. Human Development

Embryonic Development (Weeks 3-8)

Anatomy & Physiology

28. Human Development

Embryonic Development (Weeks 3-8)

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Multiple Choice

Which of the following structures helps to organize the embryo around a central axis?

Somites.

Neural plate.

Notochord.

Allantois.

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Verified step by step guidance

Begin by understanding the role of the notochord in embryonic development. The notochord is a flexible, rod-shaped structure that forms in the embryo and serves as a primary skeletal element.

Recognize that the notochord is crucial for the organization of the embryo. It provides signals that help in the development of the surrounding tissues, including the neural tube and somites.

Consider the location and function of the notochord. It is positioned along the central axis of the embryo, which is essential for the proper alignment and segmentation of the body plan.

Compare the notochord with other structures mentioned: somites, neural plate, and allantois. Somites are segmented blocks of mesoderm that develop into skeletal muscle, vertebrae, and dermis. The neural plate is a thickened region of ectoderm that gives rise to the nervous system. The allantois is involved in early fluid exchange between the embryo and the yolk sac.

Conclude that the notochord is the structure that helps organize the embryo around a central axis, providing the necessary signals for the development of the axial skeleton and influencing the patterning of surrounding tissues.