The special communications of the motive segments of the crus of the brain with the intellect : also, the separate parts of the brain producing the three voluntary powers of the muscles / by Joseph Swan.

  • Swan, Joseph, 1791-1874.
Date:
1862
Catalogue details

Licence: Public Domain Mark

Credit: The special communications of the motive segments of the crus of the brain with the intellect : also, the separate parts of the brain producing the three voluntary powers of the muscles / by Joseph Swan. 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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    It may appear that there is in reality only one exciting influence j its power may however be modified by passing from districts of convolutions and their layers differently constructed before then.' separate tracts are made capable of conveying it through the nerves to the muscles placed for producing opposing motions. The two tracts of the restiform body serve for respiration as an entire process, only that the inner portion or tract for inspiration probably influences the muscles of the neck and chest, which raise the ribs and excite the diaphragm, whilst the outer portion or tract influences the abdo- minal muscles, which by acting in opposition produce expiratory motions and assist in contracting the abdo- minal cavity for the evacuation of the viscera. The will may be conveyed in the same manner to other parts of the body for producing both flexion and extension according to a peculiarity in the arrangements of the convolutions and tracts for allowing the proper effects of each quality of motion through the muscles particu- larly constructed and placed. The intermediate layer serves for the peculiar motions of the eye, tongue, and face, and the muscles may be moved according to the direction of their fibres; but there is something more, otherwise the superior oblique muscle of the eye would not have needed a nerve from a different source, if the muscles only required the power of motion. The third and sixth nerves are derived from a special