EXAMINATION OF SOME SPINAL NERVES 49 
The slightness of solidarity of the isolated spinal cord of Monkey considered as a whole . 157 
Relation of reflex extension to reflex flexion at knee and elbow . . 158 
Extension at knee and elbow, common as a cross reflex . . 158 
Long Intra-spinal Reflex Arcs . . 158 
Definition of the term . . . .158 
The main direction of spread is aboral, contrary to the 4th law of PpLiiGER 160 
Idiolateral extension of elbow and knee, not so uncommon as in short spinal arcs . 160 
The long paths of spinal association are mainly and primarily ujicrossed . . 161 
Long, uncrossed reflexes obtained upon the limbs by exciting the tops of Goll's and i6i 
Burdach's columns and by exciting superior vermis cerebelli . 162 
Spinal cross-reflexes . . . . .162 
Definition of the term . . . . 162 
Sometimes symmetrical, but often, contrary to PflItcer's 2nd law, asymmetrical . 162 
Relation to movement of progression . . . . . 163 
Further instances of ' reciprocal ' innervation ..... 163 
Decerebrate extensor rigidity . . . . . 163 
Idiolateral flexion prepotent and inhibitant of contralateral extension at knee and elbow 
Contradictions to Pfluger's 3rd law : the cross movement sometimes more marked than the 
idiolateral . . . . . .164 
Conduction across the median sagittal plane unequally facile at different spinal levels 
Reflexes elicited by blows . . . . 1 64 
From tuber ischii, crista ilii, end of femur patella ... 165 
Cross knee-jerk and cross adductor-reflex . . , . 165 
Some features of the muscular contractions occurring in spinal reflexes 165 
Inhibition in spinal reflexes . . 165 
Instances of inhibito-motor spinal reactions . . .166 
Instances of concurrence of inhibito-motor with excito-motor reaction as part of the same 
reflex . . . . 166 
' Reciprocal innervation ' of antagonistic muscles in spinal reactions . 166 
' Decerebrate extensor rigidity'' 2.{x.zx ^xz'^o-ntxxxc \.x?i\\%dcUQ\\ . . . 166 
Probability that 'reciprocal innervation' occurs extensively in the reactions of the spinal 
cord . . . . . . .167 
Not only between contrasted muscles, but between contrasted parts of same muscle 167 
Phasic variation in the reflex activit}- of the cord .... i68 
Bibliographical References . . • l68 
Description of Pl.'^te . . . . . '73 
G 
