. A treatise on the nervous diseases of children : for physicians and students. which trans-mit motor impulses. Just sothe various portions of the pos-terior root - bundles, as theydivide up in the cord, in allprobability carry special func-tions with them. It is not agreat stretch of the imaginationto suppose that tactile sensa-tion and the sensory impulsesby which reflex action is excitedpass through the lateral series of fibres, whereas those fibres connecting withthe columns of Clarke in all probability have to do with the function of co-ordination and with the transmission of visceral sen
. A treatise on the nervous diseases of children : for physicians and students. which trans-mit motor impulses. Just sothe various portions of the pos-terior root - bundles, as theydivide up in the cord, in allprobability carry special func-tions with them. It is not agreat stretch of the imaginationto suppose that tactile sensa-tion and the sensory impulsesby which reflex action is excitedpass through the lateral series of fibres, whereas those fibres connecting withthe columns of Clarke in all probability have to do with the function of co-ordination and with the transmission of visceral sensations. Other sets offibres again must be engaged in the transmission of muscular sense, of pain,and of tactile sensation; but our studies are not yet sufficiently advancedto point out the exact groups of fibres intrusted with each special func-tion. Having traced the course of these fibres in a spinal-cord segment, it willbe well to refer to the efforts made by Thorburn, Head, Starr, and others toprove the exact distribution of function in the spinal cord, showing the main. Fig. 72.—Division of Sensory Root-fibres-man Embryo of Six Months. (Golgi.) -Hu- LOCALIZATION IN THE SPINAL CORD. 277 functions depending upon the individual segments. As the best summaryof spinal localization I give Starrs table, as he has kindly revised it for me,with the additions and corrections suggested up to date. Localization of the Functions of the Segments of the Spinal Cord. Segment. Muscles. Reflex. Sensation. II. and Sterno-mastoid. Hypochondrium (?). Back of head to III. C. Trapezius. Sudden inspiration pro- vertex. Scaleni and neck. duced by sudden press- Neck. Diaphragm. ure beneath the lowerborder of ribs. IV. C. Diaphragm. Pupil. 4th to 7th cervical. Neck. Deltoid. Dilatation of the pupil Upper shoulder. Biceps. produced by irritation Outer arm. Coraco-brachialis. of neck. Supinator longus. Rhomboid. Supra- and infra-spinatus. V. C. Deltoid. Scapular. Back of shoulder Biceps. 5th crevic
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