. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. UUM7). '.diNCt igInnMdalta: '. le," dcooMMlii^lii 4 tooeb, pain, and ipiMMt the motor Mpe from the uto- w poMarlor nwve- ior oolumns to B, deouaaation for some dis- le gTMt high- TIIB SPIKAL 475 waya of impulaea; though in all tnatuiooa it ia liitely that tb* gray matter of the oord playa an important part in modify> ing them before they reach their d
. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. UUM7). '.diNCt igInnMdalta: '. le," dcooMMlii^lii 4 tooeb, pain, and ipiMMt the motor Mpe from the uto- w poMarlor nwve- ior oolumns to B, deouaaation for some dis- le gTMt high- TIIB SPIKAL 475 waya of impulaea; though in all tnatuiooa it ia liitely that tb* gray matter of the oord playa an important part in modify> ing them before they reach their deatination. Borne obaervera believe that aenaory impulaea giving riae to pain travel by the gray matter of the cord almoat excluaively. It would be eoay to lay out the patha of impulaea in a more deftnito and dog- matic manner; but the evidence doea not aeem to wan-ant it, and it ia better to avoid making atatementa that may require aerioua modification, to aay the leoat, in a few montha. The prominent principle to bear in mind aeema to be that while there are tracta in the oord of the animala that have been exam- ined and probably of all that have well-formed apinal oordii, along which impulaea travel more frequently and readily than along othera, it Im equally true that theae paUia are not invaria- ble, nor are they preoiaely the aame for all groupa of animala. The oord can not be conaidered independently of the brain; and there can be no doubt that the paths of impulaea in the former are related to the conatitution, anatomical and phyaiologioal, of the latter. It ia atill a matter of diapute whether the oord ia itaelf irritable to a atimulus. Aa a whole it ia without doubt; aa also the white matter by itaelf. The gray matter ia certainly conducting, but whether irritable or not ia atill doubtful. Why the aenaibiUty of the aide of the body on which one lateral half of the cord haa been divided ahould be increaaed (hyperseethe- aia), is alao undetermined. Poaaibly it ia due
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