. A text-book of medicine for students and practitioners . tract are somewhat sepa-rated, but they come together helow itinto the compact bundle of the pyra-mids on the anterior surface of the me-dulla. The entrance of the motor fibersin the pyramids of the medulla havegiven the name of pyramidal tracts totheir entire extent. In the course from the internal cap-sule to the medulla oblongata all thenerve tracts for the muscles of the headbranch off laterally, and, after they havedecussated in the median line, they goto the nuclei of their respective nerves(oculomotor nuclei under the aqueductof
. A text-book of medicine for students and practitioners . tract are somewhat sepa-rated, but they come together helow itinto the compact bundle of the pyra-mids on the anterior surface of the me-dulla. The entrance of the motor fibersin the pyramids of the medulla havegiven the name of pyramidal tracts totheir entire extent. In the course from the internal cap-sule to the medulla oblongata all thenerve tracts for the muscles of the headbranch off laterally, and, after they havedecussated in the median line, they goto the nuclei of their respective nerves(oculomotor nuclei under the aqueductof Sylvius, facial nuclei in the pons, hypoglossal nuclei in the medulla, etc.).The motor fibers for the trunk and extremities remain in the pyramids, at thelower end of which the decussation of these fibers (motor decussation of thepyramids, deciissatio pyramidiim) takes place. The fibers of each pyramidpass over, for the most part, into tlie lateral column of the opposite half ofthe spinal cord, and here form the distinct bundle of the lateral pyramidal. 126.—Transverse section through thecrura cerebri in secondary degenerationof the right pyramidal tract. (FromCharcot.) Sn. Substantia nigra. degenerated and therefore translu-cent pyramidal tract. ///. Oculomotornerve. AS. Aqueduct of Sylvius.
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