. Elements of human physiology. Physiology. SPECIAL SENSES 535 equilibrium are produced. Thus if in a pigeon the hovizontal canal be divided, the head is thrown into a series of oscil- lations in a horizontal plane, which are intensified by section of the corresponding canal on the opposite side, so that the animal may fall down. After section of the posterior vertical canals the forced movements are in a vertical plane, and the animal tends to turn somersaults head over heels. After section of the Fig. End-organ of vestibular nerve in ampulla of semicircular canal (' crista aconstica').
. Elements of human physiology. Physiology. SPECIAL SENSES 535 equilibrium are produced. Thus if in a pigeon the hovizontal canal be divided, the head is thrown into a series of oscil- lations in a horizontal plane, which are intensified by section of the corresponding canal on the opposite side, so that the animal may fall down. After section of the posterior vertical canals the forced movements are in a vertical plane, and the animal tends to turn somersaults head over heels. After section of the Fig. End-organ of vestibular nerve in ampulla of semicircular canal (' crista aconstica'). superior vertical canals the movements are still in a vertical plane, and the animal tends to turn somersaults l)ackwards. After destruction of all the canals on both sides the disturb- ances of equilibrium are most pronounced and complicated. The animal can neither stand nor tly, nor maintain any fixed attitude, but is constantly executing somersaults, and moving about so violently and incoherently that it is necessary to pad its cage to prevent it killmg Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Starling, Ernest Henry, 1866-1927. Chicago : W. T. Keener
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