A Laboratory Manual and Text-Book of Embryology (Classic Reprint)
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Excerpt from A Laboratory Manual and Text-Book of Embryology
The first Changes in the form and arrangement of the cells give rise to three definite plates,. Or germ layers, which are termed from their posi tions the ectoderm (outer skin), mesoderm (middle skin) and entoderm (inner skin). Since the ectoderm covers the body, it is primarily pro tective in function, but it also gives rise to the nervous system, through which sensations are received from the outer world. The entoderm, on the other hand, lines the digestive canal and is from the first nutritive in function. The mesoderm, lying between the other two layers, naturally performs. The functions of circulation, Of muscular movement, and of ex cretion; it also gives rise to the skeletal structures which support the body. While all three germ layers form definite Sheets of cells known as epi thelia, the mesoderm takes also the form of a diffuse network of cells, the mesenchyma.
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Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com
This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
The first Changes in the form and arrangement of the cells give rise to three definite plates,. Or germ layers, which are termed from their posi tions the ectoderm (outer skin), mesoderm (middle skin) and entoderm (inner skin). Since the ectoderm covers the body, it is primarily pro tective in function, but it also gives rise to the nervous system, through which sensations are received from the outer world. The entoderm, on the other hand, lines the digestive canal and is from the first nutritive in function. The mesoderm, lying between the other two layers, naturally performs. The functions of circulation, Of muscular movement, and of ex cretion; it also gives rise to the skeletal structures which support the body. While all three germ layers form definite Sheets of cells known as epi thelia, the mesoderm takes also the form of a diffuse network of cells, the mesenchyma.
About the Publisher
Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com
This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
