Contributions from the Zoological Laboratory of the Museum of Comparative Zoology at Harvard College Volume 141-150
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Home > Art, Film & Photography > Contributions from the Zoological Laboratory of the Museum of Comparative Zoology at Harvard College Volume 141-150
Contributions from the Zoological Laboratory of the Museum of Comparative Zoology at Harvard College Volume 141-150

Contributions from the Zoological Laboratory of the Museum of Comparative Zoology at Harvard College Volume 141-150


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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. 1908 Excerpt: ... respective digits divide, the larger of the resulting branches innervating the lateral portions of the third and fourth digits. In pentadactyle animals (Caruivora and Primates) the median nervo gives off a fifth branch radial to 2 of the pig's manus, which divides and supplies the thumb and index. No remains of such a nerve branch could be detected in dissections of the normal manus of the pig. rv. in. Fio. J.--Posterior view of the left normal manus of pig, showing innervation, n. m., median nerve; 2-5, four branches of the median nerve supplying the corresponding digits. natural size. If the polydactyle manus of swine is due to reversion, we might expect to find reversive modifications in the muscles and nerves, as well as in the skeletal parts. The extensor of the thumb and index might be fully developed and its tendon inserted into the phalanges of digits i and n, as in pcntadactylo animals; the oblique extensor of the metacarpus might bo found inserted into metacarpal I, and the flexor perforans muscle might send a tendon to digit I. The pollex, if thus supplied with muscles, should be innervated by a branch from the radial side of the median nerve. In examining the following cases of polydactylism in the manus of the pig, we shall see whether these theoretical conditions are ever fulfilled. Of the thirty-six instances of polydactylism which were studied, all were of the manus; in every case, also, the supernumerary digit occurred on the radial side of the extremity. Digit n is abnormal in some cases. The abnormalities might be divided into numerous types according to the number and condition of the extra digits; but as these types grade into one another, we shall attempt to distinguish but two classes: (1) cases in which the supernumerary parts are ...


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Product Details
  • ISBN-13: 9781150107993
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 144
  • Spine Width: 8 mm
  • Width: 189 mm
  • ISBN-10: 1150107995
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 268 gr


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Contributions from the Zoological Laboratory of the Museum of Comparative Zoology at Harvard College Volume 141-150
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