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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

To contribute to the formation of a nervous system:

a. the neural crest develops into motor neurons.

b. the neural tube is converted into a neural plate.

c. the notochord induces the overlying ectoderm to become aneural plate.

d. the roof of the archenteron induces the formation of theneural tube.

e. somites give rise to the autonomic nervous system.

Summary Introduction

Introduction:

The development of the three germ layers into tissues and organs is called organogenesis. The process of organogenesis varies according to the difference in the species of the organism. The development of the nervous system in the vertebrates begins with neurulation. Furthermore, the organogenesis of nervous system takes place from the outer most germ layer, ectoderm.

Explanation

Justification/explanation for the correct answer:

Option (c) states that the notochord induces the overlying ectoderm to become a neural plate. The neurulation begins with the formation of notochord from dorsal mesoderm cells. This notochord is responsible for increasing the length of the embryo under dorsal ectoderm by its solid rod-like extension formation.

The ectoderm cells that lie above the dorsal mesoderm cell are induced by the formation of notochord to thicken the notochord. The thickened and flattened structure then formed is called the neural plate. Hence, option (c) is correct.

Explanation for the incorrect answers:

Option (a) states that neural crest develops into motor neurons. The cells of neural crest are responsible for migrating to various regions and formation of cells that are involved in various organ systems...

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