SPINAL COED AND NEEVES 



347 



He found paralysis of voluntary movement in the limbs on the 

 side of the section, which passes off to a great extent, and defective 

 sensibility on the same side, which diminishes on the return of 

 motility. Mott also observed on the operated monkey the symptom 

 known as allocheiria for pain, and perhaps also for tactile sensi- 

 bility ; when a point of the skin of the limb on the side of 



FIG. 194. Ascending degenerations after spinal hemisectionoin monkey. (Mott.) D, site of 

 complete hemisection of left side, between 5th and 6th thoracic vertebrae ; C, transverse 

 section immediately above the level of the operation ; B, section at level of 4th thoracic 

 vertebra ; A, section at level of 6th cervical vertebra. The degenerations, as shown by the 

 lighter parts of the photograph, extend to the tract of Goll, the direct cerebellar tract of 

 Flechsig, and the ventro-lateral tract of Cowers. 



the lesion is stimulated the animal refers the sensation to the 

 homonymous point on the opposite side. The return of the motor 

 functions takes place more rapidly for bilateral associated than for 

 unilateral movements ; flexion reappears before extension ; the 

 movements of the ankle-joint before those of the knee and foot ; 

 the movements of the fingers recover only very imperfectly. 



The following conclusions may be drawn from Mott's work as 

 a whole ; the sensory paths do not cross directly after they enter 

 the spinal cord ; the paths of cutaneous sensibility in general, and 



