The Morphology And Evolutional Significance of the Pineal Body Being Part I of
The book The Morphology And Evolutional Significance of the Pineal Body Being Part I of was written by author Frederick Tilney Here you can read free online of The Morphology And Evolutional Significance of the Pineal Body Being Part I of book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Morphology And Evolutional Significance of the Pineal Body Being Part I of a good or bad book?
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In adults the organ is rudimentary. It is not known whether the nerve fibers come from the large retinal elements, from the ganglionic cells of the deep retinal layer, or from the large cylindrical cells of the inner layer. The latter seems most probable in view of the conditions in Petromyzon. The parietal nerve. This nerve was first described by Spencer 366 in 1886 and has been observed by many others since then. Spencer believes that the parietal nerve is connected with the end of the epiphy...sis, that is to say, a direct continuation of the pineal organ. The entire course of the parietal nerve from the parietal eye to the brain roof was first traced by Strahl and Martin 383 in 1888 in older embryos of Lacerta vivipara and A nguis fragilis. These observers showed that the nerve was completely independent of the epiphysis. Beraneck 23 in 1892 made more exact studies and confirmed the view of Strahl and Martin. Other authors are also emphatic in stating the com- plete independence between the epiphysis and the parietal eye.
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