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Comparative Physiology of the Brain and Comparative Psychology (Paperback) Loot Price: R278
Discovery Miles 2 780
Comparative Physiology of the Brain and Comparative Psychology (Paperback): Jacques Loeb
Comparative Physiology of the Brain and Comparative Psychology (Paperback): Jacques Loeb

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Comparative Physiology of the Brain and Comparative Psychology (Paperback)

Jacques Loeb

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Loot Price R278 Discovery Miles 2 780

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This historic book may have numerous typos, missing text, images, or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1900. Not illustrated. Excerpt: ... CHAPTER II THE CENTRAL NERVOUS SYSTEM OF MEDUSAE. EXPERIMENTS ON SPONTANEITY AND COORDINATION i. Experiments on Medusae or jelly-fish afford us an excellent opportunity for analysing the conditions for spontaneity and coordination, and for deciding whether or not these phenomena are dependent upon ganglion-cells. The subumbrella of the Medusae has a very thin layer of muscle-fibres which contract rhythmically. The contraction diminishes the size of the swimming-bell, and forces the water out. By means of the recoil the animal moves forward. In regard to the nervous system, we must discriminate between two classes of Medusae: first, the Hydromedusae (Hydroidea, Fig. 1), and, second, the Acalephae, one representative of which (Aurelia aurita, Fig. 2) is familiar to many laymen. The nervous system of the Hydromedusae consists of a double nerve-ring along the margin of the umbrella (d, Fig. 1). The upper nerve-ring forms a flat layer in the ectoderm, and consists of thin fibres and ganglion-cells. The lower nerve-ring has thicker fibres and more ganglion-cells, and is connected with the upper ring by nerve-fibres. In addition to this ring, which is called the central nervous system, there is also a peripheral nervous system, a plexus, consisting of nerves and scattered ganglion cells, spread out over the whole subumbrella (J>, Fig. 1), between the epithelium and the muscle-layer. The convex surface of the umbrella consists of a non-contractile, gelatinous mass, and no nervous elements are to be found in it. Acalephae (Fig. 2) have no continuous nerve-ring, but a row of separate nerve-centres (S, Fig. 2) extends around the margin of the umbrella, lying in the ectoderm, which covers the basis of the marginal bodies (sense organs). The number of these centr...

General

Imprint: General Books LLC
Country of origin: United States
Release date: 2012
First published: 2012
Authors: Jacques Loeb
Dimensions: 246 x 189 x 4mm (L x W x T)
Format: Paperback - Trade
Pages: 76
ISBN-13: 978-1-4590-4386-2
Barcode: 9781459043862
Categories: Promotions
Books > Humanities > History
Books > Humanities > History > General
Books > History > General
Books > Science & Mathematics > Biology, life sciences > Zoology & animal sciences
Books > Science & Mathematics > Biology, life sciences > Zoology & animal sciences > General
LSN: 1-4590-4386-3

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