The Nervous System An Elementary Handbook of the Anatomy And Physiology of the
The book The Nervous System An Elementary Handbook of the Anatomy And Physiology of the was written by author James Dunlop Lickley Here you can read free online of The Nervous System An Elementary Handbook of the Anatomy And Physiology of the book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Nervous System An Elementary Handbook of the Anatomy And Physiology of the a good or bad book?
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Sight, hearing, taste, smell, and touch. Modern methods of analysis have, however, THE SEXSE ORGANS 89 shown the presence of many other forms such as temperature, pressure, pain, and the various static sensations. Several internal sensations, e. G. Hunger, thirst, etc.. Are also recognised, but these are extremely difficult to define. In the preceding chapters the pathways of the neurons from the receptive cells to the cerebral cortex have been traced. It remains to describe the receptive porti...ons of the sense organs. The Eye The essential receptive part of the organ of vision is a delicate membrane composed of several layers of nerve cells, and known as the retina. Accurate images of external objects are thrown on this membrane by means of a series of dioptric mechanisms. The whole apparatus is incorporated in a globular structure, the eyeball. The human eyeball is made up of segments of two spheres, one in front of the other. The posterior sphere, which is the larger, forms about five-sixths of the eyeball ; it contains a transparent jelly-like substance, the vitreous humour.
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