Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
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 System2h 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

Placentation

Anatomy & Physiology

28. Human Development

Placentation

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Problem 2

Textbook Question

Identify the two extra-embryonic membranes and the three different regions of the endometrium at week 10 of development in the following diagram.
<IMAGE>
a. _
b. _
c. _
d. _
e. ___

Verified step by step guidance

Step 1: Understand the concept of extra-embryonic membranes. These are structures that support the developing embryo and include the amnion and chorion. The amnion surrounds the embryo and contains amniotic fluid, while the chorion contributes to the formation of the placenta.

Step 2: Review the anatomy of the endometrium. The endometrium is the inner lining of the uterus and has three regions: the stratum basalis (the base layer that regenerates the functional layer), the stratum functionalis (the layer that thickens and sheds during the menstrual cycle), and the decidua (the modified endometrium during pregnancy).

Step 3: Examine the diagram provided in the problem. Identify the labeled structures and match them to the descriptions of the extra-embryonic membranes and the regions of the endometrium.

Step 4: For each label (a, b, c, d, e), determine whether it corresponds to an extra-embryonic membrane (amnion or chorion) or a region of the endometrium (stratum basalis, stratum functionalis, or decidua).

Step 5: Write down the names of the identified structures next to their corresponding labels (a, b, c, d, e) based on your analysis of the diagram and understanding of the concepts.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Extra-embryonic Membranes

Extra-embryonic membranes are structures that develop outside the embryo and play crucial roles in supporting embryonic development. In humans, the two primary extra-embryonic membranes are the amnion, which surrounds the embryo in amniotic fluid, and the chorion, which contributes to the formation of the placenta. These membranes provide protection, nutrient exchange, and waste removal for the developing fetus.

Endometrium

The endometrium is the inner lining of the uterus, which undergoes significant changes during the menstrual cycle and pregnancy. At week 10 of development, the endometrium consists of three distinct regions: the functional layer, which thickens and sheds during menstruation; the basal layer, which remains intact and regenerates the functional layer; and the decidua, which is the modified endometrium that supports the implanted embryo and forms part of the placenta.

Embryonic Development Stages

Embryonic development is divided into several stages, with key milestones occurring at specific weeks. By week 10, the embryo has undergone significant differentiation and organogenesis, leading to the formation of distinct structures. Understanding these stages is essential for identifying the anatomical features present at this point in development, including the extra-embryonic membranes and the regions of the endometrium.

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