The grouping of the cranial nerves ; Current nerve anatomy and physiology ; Gegenbaur on the metamerism of the head and the vertebrate theory of the skull / by Alex. Hill.

  • Hill, Alex, 1856-1929.
Date:
1888
Catalogue details

Licence: Public Domain Mark

Credit: The grouping of the cranial nerves ; Current nerve anatomy and physiology ; Gegenbaur on the metamerism of the head and the vertebrate theory of the skull / by Alex. Hill. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    result is the same as in last experiment. Section of the right cerebral peduncle produces paralysis of the left side. Section of the right half of the medulla, above the crossing of the pyramids, transfers the paralysis to the opposite side. In the frog, section of the left cerebral hemisphere produces loss of power on the right side and increased force on the left. Subsequent section of the right cerebral hemisphere restores the equilibrium. Evidence of the same kind is adduced with regard to body temperature. 7. Kesearches into the two Fundamental Principles of the doctrines received with regard to Cerebral Duality in voluntary movements. Brown-S£quard (C. B. Acad. Sci., Nov. 7, 1887). Section of right anterior pyramid, and then stimulation of its fibres, is almost always followed by movement of the right leg. The same movement results if the stimulation is at the level of the decussation. Conclusion, that each motor region acts on both sides of the body, and that each half of the base of the brain conducts fibres from both motor zones. Cerebral Physiology. 8. The Brain and Cerebral Activity from the Psycho-physio- logical point of view. Herzen (Baris, J. B. Bailliere, 1887). A popular explanation of recent advances in psycho-physics. Starts with the proposition, that thought necessitates chemical action (metabolism) of brain tissue, and that therefore it is a form of motion comparable to muscular action. Infers that every psychic act is a transmission or modification of an external impulse. Illustrates the proposition by experiment. Explains “reaction time.” Shows that it is longer with children than with adult, with boys than with girls, but after adolescence less in men than in women. External exhibition of cerebral activity in increased temperature. Latter part of the book deals with philosophical deductions. Discusses the question of free-will and consciousness, and shows the limits within which they are reconcilable with the mechanical definition of thought as a redirected sensory impulse. 9. Physiological Psychology. Sergi, trans. from Italian into .French by Mouton, revised by the Author (Paris, Alcan, 1888).