48 
THOMPSON YATES LABORATORIES REPORT 
' Late rigidity,' ' contracture ' . , . . . 133 
Self-mutilation . . . . . . -133 
Fatigue and the spinal reflexes . . . . . 133 
Phases of depressed and of improved reflexed spinal activity . . -133 
Discontinuance of stimulation as an excitant, the /<'?'OT/W<//j-r/5<?;-^^ . . 134 
The paraplegic Macaque compared with the paraplegic Dog and Cat . . 134 
Paraplegic shock compared in Monkey and Dog . . . . 135 
The place of ' block ' in the conduction chain caused by shock . . 135 
The ' isolation alteration ' . . . . . . 137 
The paraplegic Monkey more like paraplegic Man (Bastian) than like paraplegic Dog . 137 
Rules Observable in Spinal Reflex Actions . . . . 137 
The term 'spinal segment' - . . . . .137 
The surface and the deep origins of the filaments of the motor spinal root . 138 
Overlapping in the origins of the motor and afferent spinal roots . . . 138 
Spinal physiological regions . . . . . . 139 
Short spinal reflexes . . . . .139 
Degree of reflex intimacy between segments proportional to their segmental proximity 139 
For each afferent root there exists in its own spinal segment a reflex motor arc of as little 
resistance as any open to it anywhere. . . . . 141 
Plurisegmental reflex arcs of low resistance . . . . .142 
The functional solidarity of the motor nuclei for certain muscles and groups of muscles 142 
Minimal excitation of a single afferent root evokes plurisegmental 'motor' discharge 143 
The physiological significance of the nerve-plexuses of the limbs . . 144 
Comparison of the irflex, afferent^ and mntor representation of the limbs in the segments of 
the spinal cord . . . . . . .144 
In each spinal segment whereas certain motor neurons are easily excited by the afferent 
fibres of the segment, others are very difiicult to excite by those fibres . . 145 
Table of movements of the limb provoked by short-path spinal reflexes, arranged in order 
of facility of production . . . . . .146 
The rule that movement elicited by excitation of the afferent root is often widely different 
(often the converse) of that evoked by excitation of the motor root . . 147 
The inequality of excitability of spinal nerve-cell groups to local reflex excitation may be 
but the expression of a spinal arrangement for ' reciprocal innervation ' . . 148 
The excitation and activity of spinal motor nerve-cell in paraplegic rigidity and decerebrate 
rigidity, compared with the same in poisoning by strychnia and by asphyxial blood 151 
The groups of motor neurons which in one and the same spinal segment exhibit marked 
inequality of local reflex excitability innervate antergetic muscles . . 152 
The spinal reflex action in its irradiation develops a combined movement, synthesizes a 
harmonious movement . . . . . . 153 
Uniformity of reflex response despite spatial variety of provocation {^spatial monotony) . 154 
The wry-neck reflex . . . . . . . 155 
' Bahnung ' and monotonous repetition . . . . .155 
The breakdown due to fatigue involves the afferent rather than the efferent side of the 
spinal arc . . . . . . 155 
The graci/is TcRex from tiiia/is anticus tendon . . , . -155 
The ' march ' in spinal reflexes of short path . . . 155 
Alternating discharges . . . . . . .156 
Employ active contraction in only one group of an antagonistic couple at a time . 156 
