Books with author Robert Wiedersheim

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1886 Excerpt: ...but in some cases (as in Blindworms and Geckos), they extend over the whole body.1 In Snakes and Birds the tactile cells are confined to the mouth-cavity (tongue) 1 Similar structures are also present in Crocodiles, and in the skin of the hack of Trionyx cellular bodies exist, which most probably are to be regarded as tactile organs. and to the beak (cere), and lie much more closely together, forming definite masses, or "tactile corpuscles." Each of these is surrounded by a nucleated connective-tissue investment, from which septa extend into the interior, partially separating the individual tactile cells from one another. Fia. 138.--A Tactile Corpuscle (end-bulb) From The Conjunctiva Of A Mammal. N, nerve (the neurilemma of which at t becomes continuous with the investment of the tactile corpuscle; K, K, nuclei in the investment; N, the coiled termination of the nerve (axis-fibre) passing to the tactile cells (T, T). Fig. 139.--A Pacinian Corpuscle From The Beak Of The Duck. (After J. Carriere.) ZZ, cells of the nerve-sheath; L, longitudinal, and Q, circular layers of the investing lamellae; JK, central knob, with the two pillars of cells; A, axis-fibre, with protoplasmic investment, entering the corpuscle at A1; MS, medullary sheath; Nl, neurilemma, which becomes continuous with the investment of the corpuscle at f, t In Mammals the tactile cells are either isolated, as, for instance, on the hairless portions of the body, or they give rise to oval corpuscles, each consisting of a many-layered and nucleated investment, into which a nerve passes, becomes twisted up, and ends in one or more terminal ganglion cells (Fig. 138). From the Reptilia onwards, so-called Pacinian corpuscles are present in addition to the above-described tactile organs. They ...

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1886 Excerpt: ...other cranial nerves, their distribution limited to the head. In Fishes and gill-breathing Amphibians the vagus branches out to the region of the visceral and branchial apparatus, as well as to the muscles of the shoulder and anterior extremity (Protopterus). It then extends backwards along the sides of the body under the skin to the tail as one or more lateral nerves, supplying sensory organs.1 Further, in all Vertebrates it is distributed to the anterior part of the alimentary canal, giving rise to a pharyngeal, an cesophageal, and a gastric plexus, besides giving off branches to the heart and to the whole respiratory system, from the larynx to the lungs (air-bladder). Thus cephalic, cervical, thoracic, and abdominal portions of the vagus can be distinguished in the higher Vertebrates. 1 Compare the chapter on sensory organs, p. 165. Both vagus and glossopharyngeal are always closely connected with the sympathetic system by anastomoses: in Fishes the glossopharyngeal supplies the region of the first (hyobranchial) cleft, while in the higher Vertebrates it passes to the tongue as the nerve of "taste, and, like the vagus, gives rise to a pharyngeal plexus. Fig. 130.--Cranial Nerves And Brachial Plexus Of Scyllium canicula. II, optic nerve; III, oculomotor; IV, trochlear; V" (upper), superficial branch, and V (lower), deep branch of the first division of the trigeminal (the two branches anastomose at within the nasal capsule); Vbe, maxillo-mandibular branch; V, maxillary branch; V, mandibular branch; VI, abducent; VII, facial; VII", its hyomandibular branch; VIlb, its palatine branch; IX, glossopharyngeal; X, vagus; Slat, its lateral branch; ttt, gill-clefts; 1 to 14, the first fourteen spinal nerves, forming the brachial plexus (Pl.brach); O,...

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This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

This book was originally published prior to 1923, and represents a reproduction of an important historical work, maintaining the same format as the original work. While some publishers have opted to apply OCR (optical character recognition) technology to the process, we believe this leads to sub-optimal results (frequent typographical errors, strange characters and confusing formatting) and does not adequately preserve the historical character of the original artifact. We believe this work is culturally important in its original archival form. While we strive to adequately clean and digitally enhance the original work, there are occasionally instances where imperfections such as blurred or missing pages, poor pictures or errant marks may have been introduced due to either the quality of the original work or the scanning process itself. Despite these occasional imperfections, we have brought it back into print as part of our ongoing global book preservation commitment, providing customers with access to the best possible historical reprints. We appreciate your understanding of these occasional imperfections, and sincerely hope you enjoy seeing the book in a format as close as possible to that intended by the original publisher.

This is a reproduction of a book published before 1923. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed works worldwide. We appreciate your understanding of the imperfections in the preservation process, and hope you enjoy this valuable book.

Excerpt from The Structure of Man: An Index to His Past HistoryThe circumstances which led to the production 'of this work in the original German are sufficiently set forth in the annexed Introduction, and no one would admit more readily than its author that it is largely supplementary to the classical treatises of Darwin and Huxley, quoted in its pages. Experience of the practical method of scientific education has shown that it is desirable to place in the hands of the student engaged upon a first investigation of individual types of animal structure, some sound treatise of a general character, which he may read while continuing his more systematic studies. Such works awaken the mind to the comparative method of inquiry, and to the higher educational and philosophic issues to which it leads. It was this consideration which prompted me to suggest this translation, in the hope that it might be of use, in the manner indicated, to the medical student while engaged in the study of anatomy. I am further hopeful that an educated public exists to whom a knowledge of the comparative morphology of Man and the Anthropoid Apes as set forth in these pages may be acceptable. The truth of Evolution in organic nature is now generally admitted, but its application to man is not perhaps so widely acknowledged. This book, in no sense an exhaustive treatise, is an endeavour to set forth the more salient features in the anatomy of Man which link him with lower forms, and others in that of the lower forms which shed a special light on parts of the human organism. Such comparisons furnish a basis upon which to exercise judgment concerning Man's position in the series of organised beings. In dealing with these comparisons, a word of caution is, how.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.

This is a reproduction of a book published before 1923. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed works worldwide. We appreciate your understanding of the imperfections in the preservation process, and hope you enjoy this valuable book.