Search -
The nervous system, anatomical and physiological
The nervous system anatomical and physiological Author:Alexander Walker Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: when we observe, that the degrees of voluntary power always bear a close analogy to the various magnitudes of the cerebellum." Of the preceding extract, and o... more »f all the extracts from his previous Papers, which are given in this Preface, the writer begs to observe, that they are not here given as proving any doctrine; for they are divested of the details which serve that purpose, and which would themselves have made a volume : they are merely quoted as establishing priority on the subjects they refer to. In his work " Physiognomy founded on Physiology," the writer added—" While some physiologists have borrowed the preceding doctrine without acknowledgement, Dr. Fleming, in his Philosophy of Natural History, has subjected it to liberal criticism." Dr. Fleming's Objections to the Writer's Doctrine as to the use of the Ccrebel replied to. "'According to Mr. Walker,' he says, ' the cerebrum is the organ of sensation [No, not of sensation, but of united sensations or perception], or the centre to which all the impressions are communicated [Certainly, and where they form perception], and in which deliberation is practised, while the cerebellum is the organ of volition. The nerves which terminate in the cerebrum, and the anterior columns of the spinal marrow, convey impressions to the mind; and the nerves which arise from the cerebellum andthe posterior columns of the spinal marrow, execute the purposes of volition. " 'As we descend towards fishes, the cerebrum diminishes so much in size, that its total absence may be inferred in the lower classes. Observation confirms the supposition. It can scarcely be detected in the mollusca, and it is wanting in the annulosa. Now if these opinions with regard to the uses of the cerebrum and its different parts were correct, we ought to ...« less