Multiple Choice
Which of the following are the two key patterns of human growth?
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28. Human Development
Introduction to Human Development
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Which of the following structures is not developed from the ectoderm?
A
Lens of the eye
B
Epidermis of the skin
C
Nervous system
D
Liver
Verified step by step guidance1
Understand the three primary germ layers in embryonic development: ectoderm, mesoderm, and endoderm. Each layer gives rise to specific tissues and organs.
Identify the structures that develop from the ectoderm. The ectoderm primarily forms structures such as the nervous system, the epidermis of the skin, and sensory organs like the lens of the eye.
Recognize that the liver is not derived from the ectoderm. Instead, it develops from the endoderm, which forms the lining of the digestive and respiratory systems, among other structures.
Review the developmental origins of each option: the lens of the eye, epidermis of the skin, and nervous system are all ectodermal derivatives, while the liver is an endodermal derivative.
Conclude that the structure not developed from the ectoderm is the liver, as it originates from the endoderm.
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