The origin, course and terminations of corticospinal fibers in various mammals.

Publisher Summary This chapter discusses the origin, course, and terminations of corticospinal fibers in various mammals. Studies spanning a period of more than 20 centuries ultimately culminated in the discovery of the pyramidal decussation in the middle of the 19th century. During this period of confusion, Gudden suggested from experimental studies in the dog that the medullary pyramids arose within the cerebral cortex and distributed to the spinal cord. After lesions of the sigmoid gyms in puppies, sparing the striatum, Gudden noted a complete atrophy of the ipsilateral pyramid, the course of which could be followed into the contralateral lateral spinal funiculus. At that time, the importance of this basic experiment by Gudden was not recognized. The conceptual framework of the neuron theory was not yet developed sufficiently to correlate the lesion of one part of the nervous system with the degeneration of another. In their primitive form, the corticospinal terminations in the dorsal horn may subserve mainly a cortical modulation of the incoming sensory information at the spinal level.

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